Assembly, break-in & first start

#1. Oil: what to run and when

Viscosity. No maker document I could read gives a viscosity for this exact engine. The evidence: COMP's own retrofit article ran COMP Hot Rod 10W-30 [8], COMP's break-in oil is 10W-30 [2], Joe Gibbs' break-in oil is 15W-50 [3]. My pick is therefore a range, 10W-30 to 15W-50 for break-in, 15W-40 for the long-term oil (reasoning, not a maker spec: a 489 in a Kansas City summer under a truck's cooling load wants film strength, and a 15W-40 still flows acceptably at the Kansas City winter cold starts a teen will see). Low confidence. Ask Scat/Clevite what oil film their bearing clearances assume.

Zinc and phosphorus for a retrofit hydraulic roller. Roller lifters do not need flat-tappet-level ZDDP to save the cam lobes; Section 03 says that and the Counterman article agrees that roller lifters "had no effect on these engines due to the reduced friction of the roller" [9]. But Section 03's own source also says some builders still want moderate ZDDP in a retrofit roller build to protect the lifter bodies in their bores. This block is not a roller block: the link-bar lifter bodies slide in their bores, the rocker rollers and pushrod tips see load, and the cam still has bearings. Target: roughly 1,000-1,400 ppm zinc in the long-term oil, 1,200+ for the first 500 miles (my range, low confidence; I could not find a COMP, Scat, Edelbrock, ARP or Melling document that states a ppm number for a retrofit roller). The practical outcome is that Rotella T4, VR1 and Penn Grade 1 all clear it, and the mainstream passenger-car oils whose zinc is not published do not get used.

Where makers disagree:

• COMP's break-in oil includes moly; Joe Gibbs' break-in oil excludes friction modifiers [1][2].
• Section 03 says no zinc needed for roller lifters; the Speedway source it cites (Section 03 source 19) leans toward moderate zinc for retrofits. I side with moderate zinc because the cost of a 1,200 ppm oil is a few dollars per change.
• Exhaust catalysts: Valvoline says VR1 is a pushrod/flat-tappet racing oil [5]. If the exhaust (Section 15) ever gets catalytic converters, high-phosphorus oil can shorten cat life; I found no maker data on how much. Question for the owner below.

Filter. I did not research filter part numbers. Section 90 already flags that a driver-side primary can touch the filter and that a short or remote-mounted filter may be needed. Pick a quality full-flow filter that physically fits (the anti-drain-back check valve matters for a pre-oiled start), and during break-in prefer a finer micron filter, changed after the first 30-minute run [1]. Part numbers and prices not confirmed; check fit against the actual headers first.

First change interval. Joe Gibbs' guidance: change filter after the 30-minute break-in, change oil and filter again after initial break-in [1]; the Joe Gibbs BR product is described as "first 500 miles" oil, after which any conventional or synthetic oil may be used [3]. COMP's hydraulic-lifter instruction sheet (a different, flat-tappet-lifter document) says the same shape: run 2,000-2,500 rpm for the first 30 minutes, then change oil and filter [10]. Plan: oil and filter at the end of the first 20-30 minute run; second oil and filter at about 500 miles; then a normal interval (Section 93's service-log habit, about 3,000-5,000 miles or one year is my suggestion, low confidence).

Synthetic during ring seating. No maker document I read forbids it, but Joe Gibbs' break-in oil is conventional and the whole product (no friction modifiers) exists to help rings seal [1]. Use conventional (mineral) oil for the first 500 miles; switch to synthetic afterward if wanted. COMP says its additive is compatible with synthetic, so there is no chemistry reason to hurry the change [2].

#2. Assembly verification checklist (record every number on one build sheet)

Cam endplay (resolves Section 03's conflict). Street Muscle (retrofit walkthrough) says a cam button holds movement to 0.001-0.005" [8]. EngineLabs (Blueprint Series: Setting Retrofit Roller Cam Endplay) says 0.003-0.010" and warns that more than 0.010" retards the ignition timing, possibly 20 degrees at high rpm with no button [15]. Neither quotes a cam-maker document. COMP says retrofit cams "require thrust button and wear plate" (Section 03). The two ranges overlap at 0.003-0.005". Build to 0.003-0.005" (aim for about 0.004") and treat anything over 0.010" as a failure. The Cloyes Quick Button method from the same EngineLabs article: turn the adjuster in until it contacts the cam, back it out an eighth of a turn, which gives roughly 0.003" [15]. Always override this if COMP's sheet in the box gives a different number, and note it on the build sheet. Confidence: medium (the overlap is arithmetic on two published ranges, not a maker spec).

Pushrod length (measuring method and the 0.120-wall 3/8 pushrods from Section 02).

1. Assemble the short block, install heads with the final gaskets and torque, install the cam, link-bar lifters and rocker stand hardware (7/16 studs, 3/8 guide plates per Section 02).
2. Use an adjustable checking pushrod. Proform 67561 covers 7.500-8.700" (exhaust side) and 67562 covers 8.500-9.800" (intake side); the big-block Chevy needs two lengths because the intake and exhaust pushrods differ [16][17]. Prices not confirmed.
3. Adjust the checker so it just takes up lash with the lifter on the base circle and the rocker on its stud at the target preload, then pull it and measure it.
4. Check the rocker-tip sweep with a marker on the valve tips; the contact pattern should be centered. Edelbrock tells you to visually check rocker-to-valve alignment and re-torque the studs to 45 ft-lb after loosening the guide plates [Section 02].
5. Order the hardened 3/8" 0.120"-wall pushrods in the measured lengths. Section 02 notes Edelbrock retrofit pushrods were reported in 7.800" and 8.800", which is a useful first guess for the checker only.
6. Re-measure if the head gasket thickness, deck height or valve job changes.

Hydraulic-roller preload. Sources conflict and none is for these exact lifters: a COMP hydraulic-lifter note says preload "zero to 1/4 turn" past zero lash (search summary); a Morel hydraulic-roller spec is 0.040-0.060" (search summary of Engine Builder's preload article); a COMP Hustler lifter listing gives 0.035" preload on 0.075" plunger travel (search summary); steel-body hydraulic rollers have been run at "1-1/4 to 1-1/2 turns" (search summary). Read the preload number off the lifter maker's sheet for the specific lifter (COMP retrofit lifter in the CL11-450-8 kit, or Melling BB817RF16 if that is the pick), then verify it with a dial indicator on the pushrod seat or by plunger travel. Do not combine one maker's number with another maker's lifter. Confidence: low until the sheet is read.

#3. Priming and first-start checklist

Tools (Good / Better / Best):

Distributor and oil-pump drive details (what Sections 03/05/90 left open).

• The distributor lower shaft drives the oil pump, so priming happens through the open distributor hole before the distributor goes in. The Melling 10778 box is described as including a chromoly driveshaft by some retailers (search summary) while Section 01 notes retail descriptions conflict. Check the pump box on the bench; if there is no hardened shaft, buy one (ARP makes them, part number not confirmed).
• Gear material. Holley's HyperSpark 565-309 ships with a cast distributor gear and Holley says to ask the cam manufacturer which gear material to use; when changing gears, measure the shaft OD and the gear ID first (search summary of Holley's page and install PDF; PDF returned 403) [19][20]. Section 90 already resolved this as "ask the cam maker." Do that before assembly, in writing, quoting the exact COMP kit part number (CL11-450-8). Section 03 originally said melonized/nitrided only; it is now corrected (Street Muscle's gear guide, fetched in the integration pass): COMP "-8" retrofit hydraulic rollers such as CL11-450-8 are ductile-iron-class cores that tolerate iron gears, while billet-steel cores need bronze or melonized; a melonized or COMP composite gear is safe on any core and is the gear to buy for this build unless COMP's written answer says otherwise (this closes the question, section 90 U14, for the COMP kit; a custom billet grind needs the maker's answer). Until the gear is chosen, do not run the cast gear for more than the break-in run, and look at the gear teeth and the filter at the first oil change.
• Phasing. The HyperSpark 565-309 uses a clear cap that locks the rotor in the phased position: put the engine at TDC on the compression stroke (0 degrees on the damper), drop the distributor in, lock the hold-down, fit the regular cap (search summary of Holley's instruction) [19]. Do this after priming, not before.
• Thrust. With the cam button and wear plate in place, check that the gear mesh and the cam button have not changed after setting endplay; recheck endplay with the timing cover torqued.

Pre-start sequence:

1. Prime with the drill and priming tool, turning the engine by hand, until oil is visible at every rocker. With link-bar rollers this confirms the lifter oil feed through the pushrod.
2. Check oil pressure on the test gauge during priming. No pressure after a minute of priming: stop and find the problem, do not start.
3. Fill with the break-in oil and the finer-micron filter; fill the filter before installing if possible.
4. Coolant: this is an aluminum-head, iron-block engine; fill slowly, run the heater control wide open, and bleed at the highest point. Section 14's cooling parts decide the exact bleed port; a bleed screw at the highest point of the intake or an elevated radiator filler is helpful. I found no Edelbrock-specific burp instruction, low confidence.
5. Fuel: Section 90's integration check says the Terminator X Stealth 4150 uses an external regulator with base 58.5 psi (verify against Holley's current instructions) and a return line. Run the pump with the injectors disconnected or the lines opened into a can until the lines are bled and you have measured pressure on a gauge. Check every fitting for leaks before cranking.
6. Spark: set base timing and confirm the Terminator X's commanded timing against a timing light. Holley's documentation governs.
7. Check: oil filter tight, drain plug, damper bolt, header bolts, hose clamps, fuel fittings, all fluid levels, fire extinguisher at hand.

First start and the first 20 minutes:

• The Terminator X needs a base tune that can hold the engine at 2,000-2,500 rpm immediately. Load the Holley base file, pre-set a fast-idle/RPM-hold table, and have a helper on the throttle. Do not let it idle on the first start.
• Expected oil pressure at cold start: pressure should be visible within seconds. I found no maker spec for this build. A common shop rule is 10 psi per 1,000 rpm; not sourced, low confidence. Judge pressure against the Melling 10778 and bearing sheet, and shut down immediately on none.
• Vary the rpm every couple of minutes between 2,000 and 2,500 so oil splashes to different cam areas; the COMP instruction for hydraulic lifters says exactly this, and the OnAllCylinders article says 2,500 rpm, varied by a few hundred rpm, for 20-30 minutes [1][10].
• Watch for: coolant weeping at head and water-pump gaskets, oil at the filter and pan, fuel at injectors, exhaust leaks at header flanges, abnormal noise (a tick that does not leave after 10 minutes), coolant temperature, rising oil temperature.
• At the end of the run: shut down, let it cool, drop the oil and filter, cut the filter open, look for metal. Joe Gibbs does a full 30-minute break-in even on NASCAR roller-cam engines [1].

Does a retrofit hydraulic roller need the flat-tappet 20-minute/2,000-rpm run? The reason for the flat-tappet run (mating a flat lifter to a tapered lobe) does not apply to a roller. But COMP's own representative, in the OnAllCylinders roller article, still prescribes 20-30 minutes at 2,500 rpm with varied speed and no idling, plus a finer filter and a filter change [1]. Do the run. The reason shifts to ring seating, bearing and roller-bearing protection and keeping debris out of the lifters, not lobe wear. Confidence: medium-high (COMP's Reese plus Joe Gibbs' Cronquist both quoted in [1]; the COMP instruction sheet for the exact cam was not readable).

First 500 miles:

1. Vary the load and rpm: a mix of steady cruising with moderate throttle and moderate-to-hard acceleration through the gears, then engine braking down. Avoid long idling and avoid a long steady 65 mph run for the first few hours. (Standard ring-seating practice; no maker document read, low confidence.)
2. Complete at least three full heat cycles (cold to fully hot to cold) in the first 100 miles.
3. After the first heat cycle, re-torque head bolts if the fastener maker says so (Edelbrock: yes per Section 02; ARP: check the sheet), check intake bolts, valve-cover bolts and rocker-stud torque.
4. Check coolant level after each cool-down for the first week.
5. At about 500 miles: change oil and filter (to the long-term oil), cut the filter open, check the distributor gear teeth, recheck valve lash/preload, recheck cam endplay if the timing cover is accessible.

#4. Crankcase ventilation and oiling

PCV versus vented breathers. Findings from the catalog pages I could read: tall big-block valve covers typically carry a 1-1/4" breather hole between the rockers and baffles; baffles are offered for those who want to keep PCV; stock-height covers will not clear stud girdles and tall covers are the norm for roller rockers (Proform/Summit listings) [21]. I could not find a maker or builder document that compares PCV and vented breathers on a 489 specifically, so what follows is reasoning. Low confidence.

• Recommended: a closed PCV system. One baffled tall valve cover carries a PCV valve plumbed to a manifold vacuum source; the other carries a baffled breather. It keeps crankcase pressure down at a daily driver's idle (where blow-by reaches the rear seal), keeps fumes out of the cab, and it is neutral to the EFI if the vacuum port is included in the tune.
• Cam effect. A vacuum-lean cam (Section 90 row on brakes: 9-10 inHg in gear) reduces PCV draw at idle; a PCV valve on a hard-idling roller-cam engine can need a smaller orifice or the Terminator X idle trim. Test, do not assume.
• Alternative (Good tier): two vented, baffled breathers with a catch can, no vacuum connection. Cheaper, but oil fumes and a dirtier engine bay.
• Windage: the rear-sump pan from Section 90 (Assault Racing A9294-2, stroker clearance still unconfirmed in Section 90, call them) should have a windage tray or baffle; with a 4.250" stroke the crank counterweights nearly touch the pan rails on car-spec pans. Verify crank-to-pan clearance with clay.
• Pickup check: with the pan test-fitted dry, set the pump pickup to the pan floor clearance named on the pump or pan sheet (a commonly quoted figure is 1/4", low confidence), confirm the pickup is inside the sump, and check there is no interference with the crossmember or steering box (Section 90 2.10).

Oil pressure and temperature gauging. Install a mechanical or electronic gauge that is independent of the idiot light. Section 16/90's Dakota cluster (RTX-76C-PU-X) is recommended; I did not verify whether it supports oil-temperature input or which senders it accepts, so confirm before choosing the pan/block port plumbing. Use a separate test gauge for first start. Oil temperature is the signal that tells you if the optional cooler is needed.

Optional thermostatic oil cooler. Section 90 already budgets a Derale 15503 oil cooler ($98-$151). A thermostatic sandwich adapter (Derale kit family: 180 F thermostat, 3/8 NPT ports) holds oil temperature near ideal and keeps a cold engine from over-cooling. The adapter adds length between the filter and the block, which collides with header and starter clearance (Section 90 2.3); a remote-mount filter head is the usual fix. Fit only if oil temperature in a Kansas City summer commute exceeds the maker's comfort ceiling; price and exact kit not re-confirmed. Worth adding at the engine-out window because the plumbing is easier then.

#5. Engine and long-block storage before assembly

The roadmap (Section 93) puts the drivetrain window in 2030-2032, so parts may sit for years.

• Dry storage indoors, off concrete, covered; no coolant in the block.
• Raw iron surfaces (bores, deck, main saddles, cam tunnel): keep coated in a light rust-preventive oil, bagged with desiccant. VCI paper or a VCI bag is an easy add-on. Low confidence; no maker document read.
• Rollers and lifters: COMP's advice is to soak lifters overnight in quality break-in oil before installation, so keep them in clean oil in a sealed bag until then [22].
• Cam: store in its box with assembly lube on the lobes and journals.
• Pistons and rings: bag and keep boxed. Do not leave rings out of the box; they rust.
• Machined block: after the shop hones, wash the bores with hot soapy water and a brush until a clean white rag comes out clean, dry, oil immediately; an unoiled honed bore flashes with rust in hours.
• Long-block (assembled, never fired): prime and rotate before starting even if it was primed at assembly; the oil film drains over months. Plug the intake and exhaust ports; fog the cylinders; inspect before the first start by pulling the valve covers and checking the rockers.