Engine

Engine block, bottom end & machine work

Still the 489-class stroker (bore .030 over to 4.280, 4.250 stroke) if the block passes Magnaflux and sonic. The reason is stronger now. A flat-top on the stock 4.000 stroke gives only about 7.7-8.7:1 with typical aluminum-head chambers, so the stroker is what gets near 9.5-10:1. Design compression from the real…

Research note (read first). Prices below were gathered 2026-10-12 from web-search result snippets and the few vendor/forum pages that would load. Summit, JEGS (item pages), CK5 and 67-72chevytrucks returned 403/410/bot-blocks to the fetch tool, so most retail prices are search-snippet prices, not live cart checks. Every price is labeled with its source and flagged "snippet" when it was not confirmed on the vendor's own live page. Australian/NZ listings (AUD/NZD) were seen but are deliberately NOT used for pricing. Anything marked "not confirmed" needs a 2-minute check at Summit/JEGS before you order. Machine-shop prices are generic national ranges plus one KC-area forum quote; no KC shop price list was found online, so get written quotes.

The pick

Good
Path B freshen (hone, rings, bearings, pump, gaskets): about $1,050-1,700 for parts plus machine work. B+ with domed forged pistons on the stock crank: about $2,000-3,000 for ~430-480 hp. It will not reach 500 hp on the 4.000 stroke. The H661CP flat-top set alone is $186.99 (Summit snippet).
Better
489 stroker (Scat 942-1-42452 at $1,894.29 JEGS snippet, ARP 135-5402 studs at $77.99-94.99, Clevite bearings, Melling 10778 at $185.99-262.49, a C10-verified pan, B&M 20233 or Hays 10-020 flexplate at $163.78-192.95, external-balance damper if the kit is externally balanced, machine work): about $4,500-6,500, unchanged.
Best
Premium Callies/Eagle Competition or custom kit (Callies Compstar crank listed at $1,340 alone), Fluidampr or ATI damper, full machine work: about $6,500-9,000 or more, an estimate since the kit is unpriced. If the block fails inspection, add $3,600-4,200 for a new Dart Big M 31223344 block.

Build the 489-class "Path A-lite" if the sonic check is good, otherwise the B+ build. Concretely:

  1. Do the block evaluation first (casting ID, tank, Magnaflux, sonic). Total ~$250-400. This decides everything else.
  2. Preferred build: bore .030" over to 4.280", align hone, ARP 135-5402 main studs, Scat 942-1-42452-class forged 4.250" stroke rotating assembly (or an equivalent Eagle 4.250 kit) with pistons (flat top, minimal valve reliefs) chosen from the actual head chamber cc to land at 9.2-9.3:1 static (project design target; 9.5:1 absolute ceiling). With the Edelbrock 60455 (110 cc) a zero-relief flat top at 0.004" deck gives 9.26:1 and a +4 cc relief gives 9.0:1, so no dome is needed; see sections 02 and 90, Clevite 77 bearings, Melling 10778 pump with the standard-pressure spring, a pan verified to clear a C10 2WD crossmember with a 4.25" stroke (the Moroso 20416 and Canton 15-320 originally named are car-spec Chevelle/Camaro pans and are NOT documented for C10; see pan rows), balance matched to the kit (confirm with Scat whether the 942-1-42452 is internal or external), a 168-tooth SFI flexplate (B&M 20233 or Hays 10-020 if external) and matching damper. Estimated complete bottom end (parts + machine) of roughly $4,500-6,500 (this tier estimate is unchanged; with a Canton pan now $598 and a C10-verified pan possibly cheaper, the total stays inside the range). This reaches the torque target on a mild cam and 5,500-6,000 rpm with little stress on a two-bolt block.
  3. If the sonic check shows thin walls: first price a new Dart Big M 31223344 block ($3,600-4,200) against sleeving; otherwise, if the budget is tight, do the B+ build: stock crank/rods reconditioned, .030" over, new domed forged pistons (not plain flat tops) sized to the heads, same studs/pump/pan. Estimated $2,000-3,000 complete. Expect ~430-480 hp depending on heads/cam; the 4.000" stroke at ~9.2-9.5:1 will not reach the 500 hp target. (The Dart 31223344 has a 9.800" deck, the same as the stock block, so the rod / piston compression-height stack above carries over unchanged.)
  4. Skip main girdles, billet crank/rod kits and gapless-ring extras on this build. They do not buy you anything at 5,500-6,000 rpm street use.
  5. Piston choice: forged (flat top with minimal reliefs for the 489; a low dome only if the heads are bigger than ~112 cc) for about 9.2-9.5:1 on 93 octane (hypereutectic cast pistons are quieter but crack under detonation); accept a bit more cold-start piston slap for the safety margin. This is a judgment call; the sources say hypereutectic is plenty strong for 500 hp street use, but detonation resistance is what protects a young driver's engine.

If the transmission section picks the 4L80E or T56, the engine spec does not change. Corrected after section 07: the 4L80E case has the same Chevy big-block bellhousing pattern as the TH400 and takes the same 168-tooth external-balance dual-pattern flexplate (Allstar ALL26825; confirm the converter bolt circle with the builder); only the T56 changes the bellhousing and replaces the flexplate with a flywheel (section 08). In every case the flexplate/damper balance type must match the final rotating assembly.

Why it matters

The block is the foundation of the decade-long plan, and the '77 454 is a good one to start from. A 1977 truck/passenger 454 is a Mark IV, two-bolt-main, 9.800" deck, 2-piece rear main seal engine (deck height checked 2026-10-12: the production Mark IV 396/402/427/454 all share the 9.800" deck; the 10.200" tall deck was a medium-duty-truck 366/427 casting and an aftermarket option, never a production 454 - sources: chevydiy.com big-block block guide, swapmeetconnect Mark IV casting guide, corvetteforum tall-deck thread, and enginelabs.com ?p=8443, a Chevrolet Performance 454 block with 9.800" deck, 6.385" rods and 1.395" CH pistons), usually cast 3999289 (used 1972-79, two-bolt only; 3963512 is the earlier 1968-71 casting) [1][2][14]. Community consensus is that two-bolt Mark IV blocks hold ~500 hp without trouble on the street, up to about 6,000 rpm, and that main studs are cheap insurance [3][4]. That lines up almost exactly with the owner's target (500-520 hp, 5,500-6,000 rpm, NA, 93 octane, street-driven, with a long service life for a teenage driver in 2042). So the answer to "is a two-bolt main truly fine?" is yes for this build, provided the block passes inspection, the mains are align-honed with studs, and the engine is not used for sustained high-rpm track work.

The real constraint is compression, not strength. A '77 truck 454 is a low-compression emissions-era engine (published spec 8.25:1 for the 1977 truck 454 per a search-result spec sheet; exact figure to be verified on the truck by head chamber cc and piston dish) [5][6]. You cannot reach the owner's original 10.3-10.5:1 goal with the stock pistons no matter what heads go on (and sections 02/03/90 show that goal is not safe on 93 octane with a truck cam anyway: the project design target is 9.2-9.3:1 static, 9.5:1 absolute ceiling). Path B (stock bottom end) therefore tops out around 8-9:1 with aluminum heads, which is why it makes ~400-450 hp rather than 500.

Verification correction (2026-10-12): the "B+" build does NOT automatically reach 9.5-10:1. The original draft said .030" over plus new flat tops on the stock 4.000" crank gets ~9.5-10:1. My own calculation (4.280" bore, 4.000" stroke, Speed-Pro H661CP-type flat top with 1.625" compression height, which sits ~.040" down the bore on a 9.800" deck, 6.135" rod, .040" compressed gasket, ~2 cc of valve-relief) gives roughly 7.7:1 with a 119 cc chamber, 8.2:1 with 110 cc, 8.7:1 with 100 cc, 9.4:1 with 90 cc. To hit 9.5-10:1 on a 4.000" stroke you need either a domed piston (Eagle's street/strip kit uses a 25.5 cc dome), a ~.040" deck cut, or small-chamber heads. A 4.250" stroke at zero deck with a flat top gives roughly 8.5:1 (119 cc), 9.0:1 (110 cc), 9.8:1 (100 cc). So: the compression number must be designed from the actual heads' chamber cc (heads section) and then the piston dish/dome and deck are picked to land on it. Flat-top is only the right answer if the heads have ~95-105 cc chambers. The deck height is 9.800", so the zero-deck piston compression height for a 6.135" rod is 9.800 - (stroke / 2) - 6.135 = 1.665" for the 4.000" stroke, 1.540" for the 4.250" stroke and 1.478" for a 4.375" stroke (my arithmetic). The H661CP's 1.625" therefore sits 0.040" in the hole; a piston ordered at CH 1.665" (or a 0.036" deck cut) is what puts the 4.000" stroke at the 0.004" deck that section 02's tables assume. These are my calculations, not vendor numbers; have the machinist/piston maker (Wiseco, JE, Mahle, Speed-Pro) run it with the real deck, gasket and chamber cc.

Stroker question: a 4.250" stroke on a 4.280" bore gives ~489 ci (math checked). Kit cost is only a few hundred dollars more than a 4.000" stroke 454 kit (e.g. $1,894.29 for the 489 Scat kit, JEGS snippet, on sale from $1,993.99, vs. roughly $1,530-1,600 for a 4.000 street/strip Eagle kit with hypereutectic domed pistons) [8][9][10], and 489 ci would pull the torque number (540+ lb-ft) from a mild cam rather than a big one, which is exactly what a drivable 65-70 mph cruiser wants. Piston speed at 6,000 rpm with a 4.25" stroke is ~4,250 ft/min, which is fine. The cost of the stroker is mostly in the pan/clearance (notches, pan depth) and in being careful about wall thickness, not in the kit.

Options

1. Block evaluation (do this before spending anything else)

Check What / why Cost (est.)
Casting ID Look for 3999289 on the left rear of the block near the bellhousing; confirm "two-bolt" and the date code (should fall in 1976-77). Search results put 3999289 in 1972-79 passenger cars and 1973-79 trucks, two-bolt main only [1][14]. A 1977 truck could also carry a later-casting block if the engine was swapped, so read the actual number rather than assume free
Teardown inspection Pull the oil pan: look for water in the oil / rust in lifter valley, cracked lifter bores, scored walls, ridge at top of bore free
Hot tank / jet wash + Magnaflux Cleaning and crack check (cracks in main webs, lifter valley, deck). KC-area forum quote for hot tank + jet clean + Magnaflux: $140 (Automotive Machine and Performance, Lawrence; quote from an old forum thread, so re-quote) [11] $140 quoted; generic range $60-150 tank + $20-100 mag [12]
Sonic check (wall thickness) Needed before any bore past .030". Typical safe-limit guidance: min ~.200" at thrust side for aggressive builds; Chevy's own minimum is cited as .090" at 1" down with .125" preferred. 1970s blocks have variable wall thickness from core shift [13] typically $50-100 at the machine shop (generic, not confirmed)
Mark IV max bore About .100-.125" over is the cited absolute ceiling; .060" is "typical" but already thins walls [13][15] n/a

Verdict logic: if sonic shows .150"+ walls on all bores, go .030" over (4.280"). If any wall is thin, stay at .020"-.030" or sleeve one cylinder (sleeving $75-150 per cylinder, generic) [12]. Do not plan on .060" over on a 50-year-old truck block with an unknown core shift.

2. Machine work list and prices

Generic national ranges (source [12], a shop-pricing explainer; not KC-specific; ranges re-checked 2026-10-12 against the live page, they match) plus the single KC-area quote [11], which is from a September 2011 forum thread, so it is 15 years stale; treat it as a floor, not a price. Plan on the high end for a big block (more iron, more time), and expect 2026 shop rates above these generic ranges.

Operation Generic range Notes
Hot tank / jet wash $60-150 [12]; $140 combined with Mag at the Lawrence shop [11]
Magnaflux (block) $20-100 [12]; also do crank/rods if reusing
Bore + hone (plumb, torque plate) Boring $15-60 per cylinder, honing $10-20 per cylinder [12]. Ask for a torque plate hone; for a performance engine it is worth asking the shop to use the plate and mains studs torqued
Deck (square, clean up) $125-285 [12]. Not mandatory if the deck is flat, but cutting a bit evens out compression and quench
Align hone mains $75-150 [12]. Strongly recommended with main studs; cheapest insurance on a two-bolt
Cam bearings, freeze plugs $30-60 (freeze plugs) [12]; cam bearing install often bundled
Crank grind/polish (Path B only) $85-200 [12]
Balancing $300-400 for full assembly [12]. Required on Path B (new pistons, ringed stock crank). New forged kits ship balanced; confirm and match balance type (see Gotchas)
Rod recondition (resize, new ARP bolts), Path B not confirmed ask shop, typically a few hundred dollars
Girdle / main cap $200-400 [12]. Skip: unnecessary at this power on a street engine
Cylinder-head work belongs to the heads section

Typical total machine bill: Path B about $600-1,000; Path A about $900-1,500 (estimates built from the ranges above, not quotes).

3. Kansas City-area machine shops (leads only, verify before dropping a block)

I could not find a verified review page for any KC-area shop from this tool; below are forum-named or directory-listed shops only. Call and ask them about Mark IV BBC torque-plate honing and sonic checking before committing.

Shop Where What I found Link
Automotive Machine and Performance Lawrence, KS Forum members recommended it in a Sept 2011 thread (15 years old; confirm the shop still operates); "Mopar guys who race a big block Cuda," 20+ years performance engines then; quoted $140 for hot tank + jet clean + Magnaflux in 2011 [11]
Davis Machine next to a Car Quest near Nieman and Johnson Dr (Overland Park / Shawnee area) Forum-listed; does block work, hot tank, crank polish [16]
Jim Cameron Cameron, MO Recommended by forum members; no detail [11]
QCKC Automotive Machine 8712 Long St, Lenexa, KS Directory listing only [17]
Microtool 14430 W 100th St, Lenexa, KS Directory listing only [17]
Raytown Transmission (referral only) 8838 MO-350, Raytown, MO, (816) 356-8860 Square-body forum admin (Feb 2015 post) says they can refer you to a good motor-machine shop; best lead for a truck-specific builder, still a 2015 recommendation [18]
Paul's Rod & Bearing (removed) n/a The cited source [19] is a 2018 Fuel Curve article about a different business (Paul's Rods and Restos, Deer Park, Long Island NY). The Parkville, MO address and phone number in the first draft are not supported by any fetched page, so the entry was removed none
Caution Precision Crankshaft, Lee's Summit One forum poster warned against it for management reasons; treat as an unverified opinion [11]

4. Path A: performance bottom end (forged, ~489 ci or 468 ci)

Tier Brand and model Part # Price (vendor, 2026-10-12) Link Notes
Good Speed-Pro hypereutectic flat-top piston set, 454 (stock 4.000" stroke, 6.135" rod, 1.625" comp height, 2 valve reliefs, .989" press-fit pin) H661CP (STD bore 4.250"; H661CP030 for 4.280") $186.99 per set of 8, pistons only, no rings (Summit, search snippet 2026-10-12) [20] Cheap, quiet, tight clearance. A flat top on a 4.000" stroke sits ~.040" down the bore and gives only about 7.7-8.7:1 with typical 100-119 cc heads (my calculation) (see correction above). Not a 10:1 piston. Hypereutectic is more brittle under detonation; I would not trust it at 10:1+ on pump gas. Original draft listed $262.37 from a low-trust mirror site as a "ring combo kit": not confirmed, replaced
Good Scat 4340 forged "Standard Weight Competition" 454 rotating assembly, 489 ci 942-1-42452 (4.250" stroke, 6.135" rod, H-beam rods; JEGS snippet says assembly includes crank, rods with bushed pins, pistons with rings, main and rod bearings) $1,894.29 (JEGS, sale from $1,993.99; snippet 2026-10-12; JEGS page itself returned 403 to the fetch tool) [8] Price and PN re-confirmed by search. JEGS lists the assembly as unbalanced, so a machine shop must balance it to your damper/flexplate; the balance type (internal vs external) is NOT confirmed in writing (section 90's integration check reported 'external' from a search summary; a second search summary on 2026-10-12 did not repeat it). Piston type: the JEGS search summary describes a forged flat-top with a single valve relief and gives vendor compression figures of 9.4:1 with 112 cc, 9.3:1 with 118 cc and 8.6:1 with 124 cc (internally inconsistent, and the 9.4 at 112 cc cannot be reproduced: with a 0.039" gasket and a 0.004" deck it needs a net piston of about -4 cc, i.e. a piston out of the bore). Compression height and relief cc are not published. Call JEGS/Scat before ordering. Bore size 4.280" and 4.250" stroke are as listed (489.2 ci). On a 9.800" deck the 4.250" stroke / 6.135" rod stack needs a 1.540" CH piston for zero deck
Better Eagle Chevy Big Block 2-pc seal Street & Strip rotating assembly (4.000" stroke, 6.135" rod, 460 ci at 4.280" bore) 356-18202030 (JEGS item URL slug "eagle-356-18202030") $1,530.99 (JEGS snippet); Summit lists Eagle Street/Strip assemblies at $1,601.99 (snippet, PN not confirmed) [9][10] Per the JEGS search snippet this kit has hypereutectic pistons with a 25.5 cc dome (10.7-9.7:1 quoted for 112/118/124 cc chambers), NOT forged flat tops as the first draft implied. Fine for a quiet street engine, but hypereutectic is the weaker choice for 10:1 on pump gas, and it is a 4.000" stroke so it gives up the torque advantage of the 489
Better (corrected) Eagle Chevy BB 454 2-pc seal Competition rotating assembly 111504470 Not a fit for this build as listed. One retailer page shows it as 4.470" bore forged 17 cc dome pistons (502-size bore), 6.135" H-beam rods, King XP bearings, "must be balanced", special-order 10+ weeks, priced $4,613.36 CAD [7] The first draft quoted $2,626.99-$2,949.99 (JEGS snippet) and called it a 4.250/4.000 option for a 4.280" bore: that could not be reproduced and the retailer page contradicts it. Dropped from the shortlist; if Eagle Competition is wanted, get a quote for the exact 4.280" bore, 4.250" stroke part
Best Callies Compstar BBC crank, 4.250" stroke (internal balance, 2.750/2.200 journals, nitrided) as part of a custom Callies/Oliver/Carrillo-class kit CABBP425-CS (crank only) Crank: $1,340 (retailer listing, snippet) [22] Crank only; add rods/pistons: expect a $4,000-6,000+ assembled kit (not priced). K1 Technologies was searched; no BBC price found
Add-on ARP 2-bolt main stud kit, BB Chevy 135-5402 (listed as 2-bolt main stud kit) $67.99 (JJ Motorsports) to $77.99 (eBay) (snippets) [23] Buy this regardless; pair with align hone
Add-on Total Seal gapless top ring set, 4.280" bore TOT MS9190-35 (4.280 +.005 bore, 1/16 top) USD price not confirmed (AUD listing only) [24] Ring gap/clearance guidance: KB-style hypereutectics want .0065" per inch of bore in top ring gap; forged pistons need much looser wall clearance (.003-.005") than hypereutectic (~.001-.0015") [25]
Add-on Hastings moly rings, BBC 454 PN not confirmed $43.00-69.50 (snippet from the low-trust mirror; not independently confirmed) none Fine for a street build; get rings matched to the piston maker's ring pack and bore (forged pistons need ring gaps set per the maker's sheet)

4b. Alternatives the first draft omitted: new block or crate engine

A knowledgeable square-body builder would expect these on the table, especially for a decade-long build meant to be a teen's daily car. Prices are search-snippet prices, 2026-10-12, not live carts.

Option Part # Price Notes
Dart Big M Sportsman iron block, 4.250" bore, 9.800" deck, 4-bolt ductile mains 31223344 $3,599.99 (JEGS / 90 Racing, truck freight) to ~$4,211.61 (Dart); eBay $4,000-4,420 Eliminates the sonic/thin-wall/two-bolt worry entirely, allows .030-.060" over, and removes the core-shift risk. Check rear-main style (2-piece vs 1-piece) and that it takes your damper/flexplate; stock Mark IV accessories carry over
Chevrolet Performance Bowtie race block, 2-piece rear main, standard deck 19212196 $3,648.07 (snippet; tall deck 19212197 $3,623.90) Race-oriented; overkill for a street truck but a known-good block
GM crate 502 HO (Gen VI, 1-piece rear main) 19433157 MSRP $14,362.77, ~$11,202.96 sale (snippet) Not a drop-in match for a Mark IV 2-piece flexplate/damper/pan; if you go crate, buy the matching engine-specific parts. ~461 hp / 558 lb-ft at stock rpm, far from the owner's 500+ NA target with pump gas
Rebuilt original 3999289 block (the plan above) n/a machine work only Cheapest by $3,000+; fine if it sonic-checks well

When a new block makes sense: if the sonic check shows any bore under about .150" wall at .030" over, or if Magnaflux finds a crack, buying a $3,600-4,200 new block usually beats sleeving and chasing a marginal 1977 casting.

Torque/power note: a 489 at 9.2-9.3:1 with a street hydraulic roller and good aluminum heads should land around 450-500 hp (about 480 expected) / 520-560 lb-ft (estimate scaled from the published ZZ454/440 and Edelbrock RPM tests in section 02 and reasoned in section 84 C4; not a dyno result, and the owner's 500-520 hp goal is at or above its top edge); the 496/489 vs 454 torque gap is what matters here, not peak hp [26][27].

5. Path B: freshen the stock bottom end (and the B+ variant)

Build Contents Estimated parts Estimated machine Link / source
B (true freshen) Hot tank, Mag, hone only (no bore), new rings on stock pistons (only if bores are within spec), new Clevite bearings, crank polish, new oil pump, timing set, gaskets, cam bearings ~$600-900 ~$450-800 [11][12][28][29]
B+ (fallback) .030" over (sonic checked), new forged pistons with whatever dome/dish the actual heads need (a plain flat top gives only ~7.7-8.7:1 with 100-119 cc chambers on the 4.000" stroke; a domed or small-chamber combination is needed for 9.5:1), stock crank polished, stock rods resized with ARP bolts, align hone, ARP 2-bolt main studs, balance ~$900-1,500 (pistons $260-500; bearings; studs; pump; gaskets) ~$800-1,300 [20][23][26]

Path B caveat: the compression ratio is what limits you. With stock-ish 8.25:1 pistons and aluminum heads you will not hit 10:1. Plan to leave 400-450 hp on the table, or take the B+ step with new forged pistons ordered at the correct compression height.

6. Bearings, oiling, pan, balancer, flexplate, timing set, gaskets, mounts

Item Pick (Good / Better / Best) Part # Price (vendor, 2026-10-12) Link Notes
Rod + main bearings Clevite 77 P-series (Good, standard), Clevite 77 H-series high performance (Better); King in Best CB743P (rod, BBC), MS829P (main, BBC) CB743P-STD rod set $77.99 (Walmart snippet); combo MS829P-10 + CB743P-10 $133.21-$140.75 (eBay snippet); sdparts lists CB-743P at a per-shell price (not a set price). Prices unconfirmed on a live vendor cart. The "H-series" Clevite 77 upgrade is a "HX"-suffixed part number (e.g. CB-743HX), not simply "CB743H": verify before ordering [30] Verify journal sizes after crank polish; undersize PNs have suffixes (-10, -20...)
Oil pump Melling high-volume, standard-pressure 10778 $185.99 (Summit, snippet); $262.49 (finditparts, snippet): price spread, shop around [31][32] Melling 10778 is the 25%-more-volume pump for 396-454 BBC. Retail descriptions conflict on whether the box includes a standard or high-pressure spring: check the spring and run the standard-pressure one on a street engine (high pressure loads the cam gear and distributor drive). The Summit page returned empty to the fetch tool; part number confirmed only by search
Oil pan (stock-style) CJ Classic Trucks stock-type BB pan with passenger-side dipstick OP104 (chrome), OP108 (zinc) price not confirmed on CJ page (403); Speedway lists chrome 1965-90 BB pans at roughly $80-95 (search snippet) [33] Fits 1965-90 BB trucks; 4 qt (4-qt figure not re-confirmed); OK for B/B+ with a 4.000" stroke. Not stroker-clearanced
Oil pan (truck rear-sump, budget) Assault Racing Products stamped steel rear-sump 6 qt, 8 3/4" deep, passenger-side dipstick, listed as clearanced for 2WD/4WD trucks A9294-2 $52.02 (square-body forum post, date unknown, price stale-risk) [49] Forum consensus pick for square-body BBC trucks. Stroker (4.25") clearance NOT stated: confirm before using with the 489
Oil pan (performance, car-spec) Moroso wet-sump 8" deep, 6 qt, windage tray, trap door, BBC Mark IV, GM A-body (Chevelle-class) 20416 $471.99 (sdparts/eBay snippet; one Canadian retailer CA$670.23); sdparts page returned a brand landing page, price not live-confirmed [34][35] Notches for 4.25" stroke with steel rods. The Moroso article only confirms it on a 1968 Camaro / A-body cars; it is NOT documented to fit a C10 2WD crossmember. Verify with Moroso tech line or Summit's C10 vehicle filter before buying. Moroso 20403 (7 qt T-sump, notched for up to 4.50" stroke) and MO21047 (7 qt rear sump stroker-clearanced) also surfaced; C10 fit unconfirmed for both
Oil pan (higher capacity, car-spec) Canton 15-320 T-sump street pan, 7 qt, 8" deep, 12" wide, 9.5" sump, Mark IV 15-320 (Mark IV); 15-320T is the Mark V/VI version, don't mix them up $598.29 (Canton's own site, sale; regular $646.80; fetched live 2026-10-12). The first draft's $489-$537.90 / $519.48 figures were outdated [36][37] Canton's page lists fitment as "early Camaros, Novas, and '68-'72 Chevelle," not C10 trucks. Shallow front clears those large crossmembers; main-cap windage trays won't clear and it requires pickup #20-170
Harmonic balancer Stock-style externally balanced 8" (Good); Fluidampr 800111 external-balance 8", 454-502 (Better); ATI Super Damper 917740 external-balance, 7.074" OD (Best) Fluidampr 800111 (external, single 3/16" keyway, 17.1 lb, SFI 18.1); ATI 917740 (external). Do NOT use Fluidampr 620111 (396-427 internal, 6.25" OD) or ATI 917060 / 917065 (internal balance, 7.074" OD) with a stock external-balance 454 crank Fluidampr 800111: MSRP $565.00, ~$477.72 discounted (one snippet, retailer/currency unclear); other 800111 listing in AUD ignored; price not confirmed at JEGS/Summit. Fluidampr 620111 $438.70 (JEGS, snippet) is the wrong part. ATI 917060 $338.50 (eBay snippet) is internal balance, wrong for a stock 454 crank; ATI 917740 price not found. Blueprint BPP454E external (price not confirmed) [38][39][40] The first draft listed ATI 917060 as the "Best" 454 damper: it is the internal-balance 7.074" part. A '77 454 is externally balanced; the damper, flexplate and rotating assembly must all agree. The Scat/Eagle forged kits above may be internal-balance, which flips this (then use an internal-balance 8" damper and a neutral flexplate). Also check the kit is balanced to the damper you buy
Flexplate B&M or Hays SFI 168-tooth for BBC 454 (external). TCI 890-399554 removed: it is a 153-tooth plate. B&M 20233 (1970-90 BBC 454, 168T, external balance, fits TH400); Hays 10-020 (454, 168T, dual bolt pattern, SFI 29.1) B&M 20233: $192.95 (JEGS), $185.95 (Walmart), $234.29 (Lordco), snippets; Hays 10-020 $163.78 USD (jbspowercentre.com, fetched live 2026-10-12; lists 1970-90 C10/K20 trucks; special order, 10+ weeks lead time possible); TCI 890-399554 $219.95 is the wrong tooth count [41] The first draft called the TCI plate 168-tooth; two retailer listings call it 153-tooth. Factory 454s use the 168-tooth external-balance plate with the angled-bolt starter; a 153-tooth plate needs the straight-bolt starter pattern. Tooth count must match your starter and bellhousing, so count the teeth on the old plate before ordering. Gen V (1991+, one-piece seal) plates are different. SFI-rated is the choice for a high-school kid's truck
Timing set Cloyes true roller (street), BBC 396-454 Cloyes 9-3110 (original true roller, .250" rollers, ductile cam sprocket, 3-keyway crank gear, 1965-94 396-454); 9-3110A Hex-A-Just (adjustable) is a different set price not confirmed (JEGS and Speedway pages blocked/empty) [42] The first draft listed no BBC PN. PN confirmed by search result only. A stock-style chain set is fine for a flat-tappet or hydraulic-roller street cam; the cam section decides cam-specific needs (retainer plate, thrust, fuel pump eccentric deleted for the electric-pump plan)
Gasket set Fel-Pro full gasket set, BBC 396-454, 1965-90 Fel-Pro 2815 (premium set, 1965-90, bore 4.500" or less); also Fel-Pro 1804 oil pan set; Fel-Pro 2703 R.A.C.E. set price not confirmed (finditparts/Transend listings seen by search only) [43] The first draft's "Fel-Pro 260-1046 overhaul set" could not be found anywhere and has been removed. The linked kit page (mps.klizer.co, Fel-Pro 17124) was unreachable, and the other cited page (EGK17) is a Ford FE 390/427/428 kit, not Chevy. Match the head gaskets to your heads and bore (head-gasket PN comes from the heads section); the set's rear seal must be the 2-piece type
Rear main seal Fel-Pro 2904, 2-piece silicone, BBC 396/427/454 Mark IV 2904 $18.56-$21.99 (sdparts, finditparts, eBay snippets) [43] Verified by search: Fel-Pro 2904 is the 2-piece Mark IV BBC seal. A 1991+ Gen V one-piece block needs different parts; the '77 does not
Engine mounts CJ Classic Trucks 402/454 mounts for C10 1972-87 602395-V from $13.29 (CJ Pony Parts, snippet) [44] See Gotchas: forum owners use small-block mounts and shims
Engine mounts (QA1 crossmember) QA1 BB/SB mount kit for QA1 C10 crossmember 1973-87 7740-375 $179.95 sale / $199.36 MSRP (snippet) [44] Only fits the QA1 crossmember

Fitment & gotchas

  • Balance type is the number one mistake. Pre-'89 BB 454 is externally balanced; many aftermarket forged kits are internally balanced (neutral balanced). If you buy an internally balanced kit you need a plain (non-weighted) damper and flexplate; if you reuse the stock crank/rods/pistons you need the external (454-weighted) damper and flexplate [39][40][45]. The Fluidampr 620111 and ATI 917060 are internal balance; the external-balance 454 parts are Fluidampr 800111 and ATI 917740.
  • Rear main seal: the '77 uses a 2-piece seal. Make sure the rotating assembly, gasket set and flexplate are 2-piece-seal parts. Gen V/VI one-piece parts do not fit.
  • Oil pan vs crossmember: forum owners report 454 pans rubbing the factory crossmember when mounts are worn or the wrong height; a tall-deck 427 pan was "close" [46][47]. Small-block mounts and aluminum shims are the proven fix [48]. Test-fit the pan with the engine on mounts before you finish the lower end, and clearance the crossmember ahead of time if needed.
  • Dipstick tube is on the passenger side in many truck pans; confirm against the pan you buy (CJ lists "passenger side dipstick") [33].
  • Windage trays and Canton pans: Canton states its main-cap mounted trays don't fit the 15-320 and it requires pickup 20-170 [36]. Plan pump/pickup/pan as a matched set.
  • Big-block mounts use the same frame perches as the small block in these trucks; do not buy a "BB-only" mount that needs different perches [48]. Buying new mounts raises the engine slightly versus sagged ones.
  • Starter clearance and steering linkage: Moroso's 20416 is advertised (on Camaro/A-body cars) to keep the factory steering linkage and standard starters [34][35]; no source shows this on a C10, so verify with your steering box (the C10 box and center link sit differently than a Camaro's) and header choice. One forum poster notes that Milodon's truck-style pan 31000 has no center-link notch and only ~3/8" clearance on his car, a reminder that pan-to-linkage clearance is vehicle specific.
  • Flexplate tooth count and starter: the factory 454 uses a 168-tooth plate with the angled-bolt starter; a 153-tooth plate (e.g. TCI 890-399554) needs the straight-bolt pattern. Match the new flexplate to the starter already on the truck.
  • Block casting: the block seen in one square-body thread was a "HI-PERF PASS" 3999289; truck blocks may be marked TRUCK. Either is fine [14]. Do not assume the 3999289 is a four-bolt: it is a two-bolt only casting [1].
  • Compression math: use the actual combustion chamber cc of your heads, gasket thickness, deck height after any cut, and piston dish/dome, not catalog numbers. for this truck the comfortable static ceiling on 93 octane is about 9.2-9.5:1 with the cam in section 03 (dynamic compression, not static, is what knocks; see section 02). 10:1 and above is only for EFI knock control and a dyno tune [25].

How it touches other systems

  • Heads and cam: piston dish/dome and deck cut set compression; the cam section's duration and vacuum affect pump gas tolerance. A 489 with a roller cam may give only 9-12 in. of idle vacuum, so the project uses hydroboost (brakes section) and does not depend on cam vacuum.
  • Transmission and converter: engine torque (540+ lb-ft) is within the TH400's tolerance with a rebuild; the 4L80E is the stronger choice. Converter stall must match the cam. Flexplate (168-tooth, correct balance) must match the converter and trans bolt pattern.
  • Oil pan and exhaust/steering: pan sump position and header primary routing share space with the steering box and crossmember. Choose the pan before choosing headers.
  • Fuel and EFI: bottom end spec does not change with carb vs EFI, but an EFI pan/sensor bung (and dipstick) planning belongs with the oil system. A rear-sump pan moves the oil pickup clear of the front crossmember, but note the Canton and Moroso 20416 listed here are car-spec; use a C10-verified pan.
  • Cooling: a 489 making ~500 hp produces more heat than a stock 454 (see the heat-rejection estimate in section 14); the Cold Case radiator plan fits this.
  • Fuel octane: compression decision here sets the minimum octane for the life of the truck. If Walter ever gets 87-octane gas in it, a 10:1 engine will knock; for a teenage daily driver, a 9.2-9.3:1 static target with aluminum heads and a cam that closes the intake at 41-45 degrees ABDC is the safer call than the owner's original 10.3-10.5:1 aim, and costs very little power. Retarded timing or an EFI knock-adaptive map is the real backstop.

Check on the truck

  1. Pull the dipstick area and read the block casting number and date code (left rear of block). Is it 3999289? Any "TRUCK" marking?
  2. What are the head casting numbers and chamber cc of the current heads (to compute the stock compression)?
  3. Is the truck 2WD with the factory crossmember intact (no hot-rod crossmember)? Any previous engine pan rub marks on it?
  4. Which engine-balance type is the existing crank (external for the stock 454)? Are you open to a new internally balanced forged kit if so?
  5. Do you want to stay at 4.250" stroke (489 ci) or stay at 4.000" (468 ci with .060" bore, not recommended)? How important is the torque number versus cost?
  6. The project design is 9.2-9.3:1 static (DCR about 8.4-8.6) rather than 10:1+; are you comfortable giving up the last point of compression for a wide octane safety margin for decades?
  7. Is the engine currently running with oil pressure and compression numbers known? A compression test and leak-down before you pull it would tell you whether you can do Path B at all.
  8. Will you keep the Turbo 400 (the flexplate bolt pattern is the same; the stock converter will need to be recoiled/stalled to the cam) or go 4L80E?

Fact-check notes

Adversarial check run 2026-10-12. Method: WebFetch (many vendor pages return 403/410/empty to the fetch tool) plus WebSearch to confirm part numbers, fitment and prices. Prices labelled "snippet" are search-result prices, not live carts.

What was checked and held up

  • 3999289 is a two-bolt-only Mark IV 454 casting used in 1972-79 passenger and 1973-79 truck engines (search result summaries of camaros.org/NCRS threads); 454 stock truck compression 8.25:1 in 1977 (search result).
  • Scat 942-1-42452 exists: 489 ci, 4.250" stroke, 6.135" rod, $1,894.29 (JEGS, sale from $1,993.99; snippet). Melling 10778 exists as the 25%-more-volume BBC 396-454 pump (Summit/enginemaster/jbs search results). Cloyes 9-3110 true roller BBC set exists. Fel-Pro 2904 is the 2-piece Mark IV rear main seal. QA1 7740-375 for C10 1963-66/1973-87 confirmed ($179.95 CJ, $170.95 Ecklers, snippets). CJ 602395-V 402/454 C10 mount confirmed (from $13.29). Hays 10-020 confirmed live: 168T, external balance, $163.78, fits C10 trucks. Machine-shop generic price ranges match the live bullnosegarage page. Canton 15-320 and 15-320T pages fetched live. ARP 135-5402 BB 2-bolt main stud kit $77.99 (eBay) / $94.99 (Hardin Marine), snippets.
  • Fluidampr 620111 is internal balance (396-427), correctly flagged as wrong for the 454.
  • Two-bolt main strength claim and .030" over plan are consistent with sources (kevinsautos live: max overbore .100-.125", typical .060"; Chevy minimum wall .090" / .125" desirable).

What was wrong and changed in place

  1. B+ compression claim (biggest error): flat tops on the stock 4.000" stroke give ~7.7-8.7:1, not 9.5-10:1. Added my own calculation, corrected the B+ row, recommendation and octane guidance (now 9.5-10.0:1 design, 9.5-9.8:1 for a teen daily), and changed the piston recommendation to "forged, dome or flat as the heads require". (Superseded 2026-10-12 integration pass: the design target is now 9.2-9.3:1 static per section 90, and the deck height used here, 9.800", was verified correct against four sources; section 02's earlier 10.200" figure was the error.)
  2. Flexplate: TCI 890-399554 is a 153-tooth plate, not 168. Replaced with B&M 20233 (168T, $192.95 JEGS snippet) and Hays 10-020 (live-confirmed); added tooth-count/starter gotcha.
  3. Dampers: ATI 917060 (listed as the "Best" 454 damper) is internal balance, 7.074" OD. Replaced with external-balance ATI 917740 and Fluidampr 800111; prices unconfirmed.
  4. Oil pans: Moroso 20416 and Canton 15-320 are Chevelle/Camaro/Nova-fitment pans; no source supports them on a C10 2WD crossmember. Canton price corrected to $598.29 (live; draft said $489-$538/$519). Added the forum-favored truck rear-sump pan (Assault Racing A9294-2, $52.02 forum price, stroker clearance unverified) and Moroso 20403/MO21047 as unverified alternatives. Recommendation now requires a C10-verified pan.
  5. Eagle 18202030 is hypereutectic with a 25.5 cc dome (not forged flat top as implied). Eagle 111504470 is a 4.470"-bore special-order kit priced in CAD ($4,613.36); the draft's $2,627-2,950 and "454 4.000/4.250" description could not be reproduced. Dropped from the shortlist.
  6. Speed-Pro H661CP: it is a pistons-only set (4.250" STD bore, 4.000" stroke application), $186.99 Summit snippet, not a $262.37 ring combo from a mirror site. The mirror link (410 Gone) was replaced.
  7. Fel-Pro 260-1046 overhaul set could not be found and the cited pages were dead/wrong (mps.klizer.co refused connection; EGK17 is a Ford FE kit). Replaced with Fel-Pro 2815/1804/2703 and 2904 (prices unconfirmed except 2904).
  8. Cloyes timing set: the cited Summit URL was the wrong PN family; added the confirmed BBC PN 9-3110.
  9. Paul's Rod & Bearing (Parkville MO) entry removed: the cited source is an unrelated Long Island shop article.
  10. Source [14] was cited for Mark IV specs and 3999289 years but only shows a member finding the casting and another confirming two-bolt mains. Re-labelled. KC forum quotes are from 2011 and 2015, now marked stale.
  11. Melling 10778 retail descriptions conflict on standard vs high-pressure spring; flagged to verify, price range widened ($185.99-$262.49 snippets).
  12. Softened the unverified claim that the 4L80E uses the same BBC flexplate as the TH400; later confirmed by section 07 (same Chevy bellhousing pattern, same 168T external-balance plate) and the text above now says so.

Added (was missing): new-block and crate options (Dart Big M 31223344 $3,600-4,200; Bowtie 19212196 $3,648; GM 502 HO 19433157, which is 1-piece rear main), with a trigger for when to buy new instead of rebuilding.

URL spot-check (about 30 fetched or search-confirmed): fetched OK: Canton x2, gmsquarebody 454-oil-pan, 449417, 889118, bore-hone-where-in-kc, chevyhardcore p=6342, bullnosegarage, kevinsautos, forabodiesonly KC thread, jbspowercentre 111504470 and 10-020, fuelcurve. Blocked (403) or empty, but PN confirmed by search: JEGS Scat, Cloyes, TCI, Fluidampr; Summit 10778 and the Cloyes Summit link; sdparts Clevite and Moroso (brand landing pages), CJ OP104/602395-V/QA1 pages; dsmtuners. Dead or wrong: plastiquealaloupe mirror (410), enginelabs p=255586 (410), mps.klizer.co (connection refused), fuelcurve (wrong subject), mancini ATI page (lacks the cited parts), ncrs-style camaros.org page had an expired certificate. Unfetchable pages that remain cited are search-result URLs only and are noted as such.

Still unconfirmed and left as such: every JEGS/Summit live cart price, Clevite H-series PN, Fluidampr 800111 and ATI 917740 prices, Callies kit price, Fel-Pro set prices, which pan clears a 4.25"-stroke engine in a 2WD C10, and every KC shop's current status and pricing.

Recommendation status: still the 489 stroker if the block passes Magnaflux/sonic (it is the only path that reaches the 9.2-9.3:1 target with plain flat tops and keeps torque on a mild cam), with fallback B+ using domed pistons, and a new block as the alternative to sleeving. Tier estimates unchanged: Good $1,050-1,700 (B) / $2,000-3,000 (B+); Better $4,500-6,500; Best $6,500-9,000+.

Sources 50

  1. camaros.org - 454 block casting numbers 3963512 vs 3999289 (search result)
  2. tst.forums.ncrs.org - 454 block casting discussion (search result)
  3. pro-touring.com - two-bolt main strength discussion (search result)
  4. forabodiesonly.com - two-bolt main studs advice (search result)
  5. gmsquarebody.com - "454 Big Block Chevy Build" (search result)
  6. ck5.com - 454 piston compression (search result)
  7. jbspowercentre.com - Eagle 111504470 (fetched: 4.470" bore, 17 cc dome, $4,613.36 CAD, special order)
  8. jegs.com - Scat 942-1-42452 489ci (search result; fetch blocked 403)
  9. jegs.com - Eagle street and strip assembly (search result)
  10. summitracing.com - Eagle assembly at Summit (search result; fetch returned empty)
  11. forabodiesonly.com - KC shops, $140 tank/jet/mag quote (fetched)
  12. bullnosegarage.com - machine-work price ranges (fetched)
  13. kevinsautos.com - overbore limits (fetched); sonic-check minimums from a related search result kevinsautos.com
  14. gmsquarebody.com - a member found casting 3999289 on his block and another confirmed two-bolt mains from photos (fetched; it does NOT contain Mark IV specs, compression or years, as the first draft implied)
  15. airforums.com - 454 overbore discussion (search result)
  16. dsmtuners.com - KC machine shop thread, Davis Machine (search result; fetch blocked)
  17. yellowpages.com - directory listing for KC-area shops (search result)
  18. gmsquarebody.com - Raytown Transmission referral (fetched)
  19. fuelcurve.com - WRONG SOURCE: a 2018 profile of Paul's Rods and Restos in Long Island, NY; does not support the Parkville MO entry (removed)
  20. summitracing.com - Speed-Pro H661CP, $186.99 set of 8 (search snippet; replaced the original mirror link, which returns HTTP 410 Gone)
  21. jbspowercentre.com - Eagle 35320060 heavy duty 454 assembly (search result)
  22. enginemaster.com.au - Callies Compstar BBC 4.250 crank specs (search result; AUD price ignored); US $1,340 from ebay.com
  23. jj-motorsports.com - ARP main stud kit pricing area (search result); BB 135-5402 at ebay.com
  24. enginemaster.com.au - Total Seal MS9190-35 (AUD only)
  25. enginelabs.com - piston-to-wall and ring gap math; plus chevyhardcore.com (Mahle piston tips) and enginelabs.com (ring gap)
  26. 67-72chevytrucks.com - 454 vs stroker discussion (search result)
  27. ck5.com - 454 rebuild vs 496 (search result; fetch blocked)
  28. stovebolt.com - rebuild cost thread (search result)
  29. gmt400.com - realistic prices for building 383 vs 454 (search result)
  30. sdparts.com - Clevite CB-743P (search result); JEGS main bearings jegs.com
  31. summitracing.com - Melling 10778 (search result; $185.99; fetch blocked)
  32. enginelabs.com - Melling high-volume / high-pressure pumps (search result)
  33. cjponyparts.com - CJ BB truck oil pan (search result; fetch blocked)
  34. chevyhardcore.com - oil pan advice for stroker big block incl. Moroso 20416 (fetched)
  35. sdparts.com - Moroso 20416 $471.99 (search result)
  36. cantonracingproducts.com - Canton 15-320T (fetched)
  37. cantonracingproducts.com - Canton 15-320 Mark IV (search result)
  38. jegs.com - Fluidampr 620111 (internal balance 396-427; wrong for a 454; page returned 403). External-balance 454 part: Fluidampr 800111 per willysworkshop.com.au
  39. blueprintengines.com - BBC external balance balancer (search result)
  40. manciniracing.com - fetched: does NOT list ATI 917060 or 917740 (only a Chrysler damper); ATI 917740 external-balance BBC per fastlanespares.co.nz (search result), ATI 917060 internal per vincentperformance.com
  41. jegs.com - TCI 890-399554 (listed as 153-tooth by other retailers; JEGS 403); Hays jbspowercentre.com (fetched, 168T, $163.78); B&M 20233 jegs.com (search result)
  42. jegs.com - Cloyes 9-3110 true roller BBC (search result; JEGS 403). The original Summit link (clo-9-3610wx9) was the wrong PN family and returned empty
  43. DEAD/WRONG: mps.klizer.co... (connection refused) and cjponyparts EGK17 (a Ford FE 390/427/428 kit) removed. Replacement: Fel-Pro 2815 / 1804 / 2703 per finditparts.com family listings and Fel-Pro 2904 rear main seal finditparts.com (search results)
  44. cjponyparts.com - CJ 402/454 mount; QA1 kit cjponyparts.com
  45. speedwaymotors.com - external vs internal balance guide (search result)
  46. mail.67-72chevytrucks.com - 454 oil pan vs crossmember owner report (search result)
  47. ck5.com - higher-capacity 454 pan (search result; fetch blocked)
  48. gmsquarebody.com - motor mounts for 454 in square body (fetched)
  49. gmsquarebody.com - forum thread naming Assault Racing A9294-2 as the square-body BBC truck pan, $52.02 (fetched)
  50. dartheads.com and jegs.com - Dart Big M 31223344 (search results)