12496963 ZZ502 Base Engine

Part Number: 12496963

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Part Number: 12496963
Engine Type: Chevy Big-Block V-8
Displacement (cu in): 502
Bore x Stroke (in): 4.470 x 4.000
Block (P/N 19170540): Cast-iron with 4-bolt main caps
Crankshaft (P/N 10183723): Forged steel
Connecting Rods (P/N 19170198): Forged steel, shot peened
Pistons (P/N 12533507): Forged aluminum
Camshaft Type (P/N 12366543): Hydraulic roller
Camshaft Lift (in): .527 intake / .544 exhaust
Camshaft Duration (@.050 in): 224° intake / 234° exhaust
Cylinder Heads (P/N 12363390): Aluminum oval port;
110cc chambers
Valve Size (in): 2.250 intake / 1.880 exhaust;
stainless steel
Compression Ratio: 9.6:1
Rocker Arms (P/N 12368082): Stamped steel
Rocker Arm Ratio: 1.7:1
Recommended Fuel: 92 octane
Ignition Timing: Base 8° BTDC, 30° total
Maximum Recommended rpm: 5,800
Balanced: External

General Motors Warranty Information

Select the parts below to finish your crate engine and get running in less time!

19154550 Super-Matic 4L85-E Four-Speed Automatic Transmission

19212657 Transmission Controller

19172805 Serpentine Accessory Drive system

19168602 Aluminum Water Pump

19131359 High Rise Intake Manifold

19170095 Carburetor, Holley 850-cfm

• 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!
• 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