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474ci Engine Build - Pump-Gas Poncho Power

Engine Buildup Worksheet
Engine
Engine Displacement473.5 ci
Peak Horsepower578 at 5,500 rpm
Peak Torque588 lb-ft at 4,700 rpm
Bore/Stroke4.212x4.25-in
Bore/Stroke Ratio0.991:1
Rod/Stroke Ratio1.60:1

Bottom End
Block DescriptionYC-code No. 485428
Year’71
Block PreparationBored 0.060-in
Deck HeightZero
CrankshaftButler Performance, forged-steel, 4.25-in stroke, 3.25-in main journal, 2.20-in rod journal
Crank PreparationNormal
Main CapsPro-Gram Engineering, No. PRO-P455F front, No. PRO-P455C center three, No. PRO-P455R rear
Main Bearing Clearance0.003 in
BalancerPerformance Street Balancer No. PBO-PB1056ST
RodsEagle Specialty Products, forged-steel, H-beam, 6.800-in length, 7/16-in ARP bolts
BearingsFederal Mogul No. 151M-STD main journal, Federal Mogul 8-7200CH-STD rod journal
PistonRoss custom, forged-aluminum, 4.211-in diameter, flat-top, 439.5 grams, 8.5cc reliefs
Piston to Deck HeightZero
Piston PinsFerrea No. P70028-8, forged-alloy, 0.990-in diameter, 138 grams
Piston RingsTotal Seal No. CR3455-65, plasma-moly, file-fit, 0.018-in gap
FastenersARP 194-5601 four-bolt main-stud kit
BalancedYes

Oiling System
Windage TrayNo
Crank ScraperNo
Oil PanCanton No. 15-450, road-race
Oil PumpMelling M54F
OilShell Rotella 30W

Heads
Casting NumberEdelbrock No. 60569-2
ChamberOpen, hand-smoothed
Combustion Chamber Volume90 cc’s
Compression Ratio9.95:1
Head ModsFully ported intake and exhaust ports
Intake Port VolumeApprox. 220 cc’s
Intake/Exhaust Flow Ratio75 percent
Intake/Exhaust Flow at 28-in:
0.200 140/86 cfm
0.300201/173 cfm
0.400258/199 cfm
0.500292/217 cfm
0.600312/230 cfm
0.700316/236 cfm
Intake ValveFerrea No. 5073, stainless steel, 2.11-in, 5.100-in length
Exhaust ValveFerrea No. 5144, stainless steel, 1.77-in, 5.100-in length
AnglesMulti-angle with 45-deg seats
RetainersComp Cams No. 740-16, 10 deg
LocksComp Cams No. 611-16, 10 deg
ValvespringsLunati No. 73100-16
Install Height1.79 in
Seat Pressure137 psi
Open Pressure338 psi
ValveguidesBronze, 0.530-in diameter
Valve SealsViton
Rocker StudsARP No. 100-7101, 7/16-in
Rocker ArmsComp Cams No. 19060, full roller
Rocker Ratio1.5:1
PushrodsButler Performance No. SBR-581-R-16, 5/16-in diameter, 8.80-in length, chrome-moly
FastenersARP No. 190-3605 head-bolt kit


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Pontiac Solstice Research
Pontiac Solstice Get updated on all your car buying needs from safety features, to specs, to crash test ratings and options. Get all the information you need if you are interested in buying a new car like the Pontiac Solstice. The L4 standard engine in the Solstice gives you 173 horsepower with an estimated 22 mpg. It has a comparable trade in value which should come in handy when you go to shop for your next car. The Pontiac Torrent and the Pontiac G6 are other vehicles that might interest you.

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