502 HO
461 HP @5,100 RPM / 558 LB-FT TORQUE @3,400 RPMprice: $9,176
part number: 12568778
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Affordable Big-Block performance with huge torque and 461 hp With 461 horsepower and 558 lb-ft of torque, our 502 HO crate engine has power on tap for every need whether its a 69 Chevelle at the drag strip or the Suburban that towed it there. The 502 HO is all about torque and it hovers at the 558 lb-ft mark at only 3400 rpm and arcs gently above the 500 lb-ft level by 2800 rpm, remaining there through 4200 rpm. All those axle-twisting pound-feet are rooted in a stronger, updated four-bolt cylinder block that houses a forged steel crankshaft, forged and shot-peened rods, and forged aluminum pistons. In other words, its a super-stout assembly that is as durable as it is powerful. Iron, rectangular-port cylinder heads keep the 502 HO affordable, and our crate engine assembly includes an aluminum dual-plane intake manifold, a water pump, 14-inch flexplate, balancer, and more. You add the carburetor, starter, and ignition system.
Part Number: 12568778
Engine Type: Chevy Big-Block V-8
Displacement (cu in): 502
Bore x Stroke (in): 4.470 x 4.000
Block: Cast-iron with 4-bolt main caps
Crankshaft: Forged steel
Connecting Rods: Forged steel, shot peened
Piston and Ring Kit: Forged aluminum
Camshaft Type: Hydraulic roller
Camshaft Lift (in): .510 intake / .540 exhaust
Camshaft Duration (@.050 in): 211° intake / 230° exhaust
Cylinder Heads: Iron rectangular port; 118cc chambers
Valve Size (in): 2.190 intake / 1.880 exhaust
Compression Ratio: 8.75:1
Rocker Arms: Stamped steel
Rocker Arm Ratio: 1.7:1
Water Pump: Cast-iron, long-style
Flexplate: 14"
Recommended Fuel: Regular pump
Ignition Timing: 32° Total at 4,000 rpm
Maximum Recommended rpm: 5,500
Balanced: External
Intake Manifold: Dual Plane
Requires addition of carburetor, fuel pump, starter, distributor and ignition system (not included)
Clutch linkage bosses are now drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance
502 engines now have a mechanical fuel pump boss! NOTE: There is NO fuel pump lobe behind the boss.
Comes with an externally balanced 14" automatic transmission flexplate. Use flywheel P/N 14096987 and 11" clutch assembly for manual transmission applications
Designed for pre-1976 street vehicles or any off-road vehicle
Not intended for marine applications
NOTE: Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.