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Chevrolet Performance 12496963 - Chevrolet Performance ZZ502/502 Base 502ci/502HP Engine

Chevrolet Performance 12496963 - Chevrolet Performance ZZ502/502 Base 502ci/502HP Engine
Chevrolet Performance 12496963 - Chevrolet Performance ZZ502/502 Base 502ci/502HP Engine

JEGS Part Number: 809-12496963

ZZ502 Base Engine
  • Long Block (Assembled)

    Chevrolet Performance 12496963 Details

    ZZ502 Base Engine

  • 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
  • The 502 engines now have a mechanical fuel pump boss!
  • Comes with an externally balanced 14'' automatic transmission flexplate. Use flywheel P/N 809-14096987 and 11" clutch assembly for manual transmission applications
  • Designed for pre-1976 street vehicles or any off-road vehicle
  • Not intended for marine applications
  • For long blocks and partial engines with steel camshafts, a distributor with a melonized steel gear must be used or engine damage will occur. Distributor #809-93440806 is recommended.

  • Chevrolet Performance ZZ502/502 Base 502ci/502HP Engine

    The DIY Foundation for Big Torque!

    Free Shipping!

    It's simple: The ZZ502/502 Base crate engine is offered for builders who want the super-strong bottom end and high-flow aluminum oval-port cylinder heads, but also want to finish your engine, your way.

    The ZZ502/502 Base engine uses our new cylinder block casting that is stronger and better suited to high-performance combinations. A forged steel crankshaft, forged rods, and forged pistons form the reciprocating assembly, with a smooth-operating hydraulic roller camshaft delivering big 0.527/0.544-inch lift. The lightweight aluminum heads boast 110-cc combustion chambers and big, 2.25-inch intake and 1.88-inch exhaust valves.

    Chevrolet rates the ZZ502/502 Base engine at 508 horsepower and 580 lb-ft of torque when it is finished with Chevrolet Performance aluminum intake manifold (P/N 809-12363406) and Holley 870-cfm carburetor (P/N 809-19170094). The other parts you need to complete the engine - including chrome dress-up parts can be found here at or give one of our JEGS technical specialist a call at 1-800-345-4545, 24/7!

    ZZ502/502 BASE TECH SPECS:
  • Engine Type: Chevy Big-Block V-8
  • Displacement: 502ci
  • Bore x Stroke: 4.470'' x 4.000''
  • Block: Cast-iron with four-bolt main caps
  • Crankshaft: Forged steel
  • Connecting Rods: Forged steel, shot peened
  • Pistons: Forged aluminum
  • Camshaft Type: Hydraulic roller
  • Camshaft Lift: .527'' intake / .544'' exhaust
  • Camshaft Duration (@.050 in.): 224° intake / 234° exhaust
  • Cylinder Heads: Aluminum oval port, 110cc combustion chambers
  • Valve Size: 2.250'' intake / 1.880'' exhaust; Stainless steel
  • Compression Ratio: 9.6:1
  • Rocker Arms: Stamped steel
  • Rocker Arm Ratio: 1.7:1
  • Flexplate: 14'' diameter, externally balanced
  • Recommended Fuel: 92 octane
  • Ignition Timing: Base 8° BTDC, 30° Total
  • Maximum Recommended RPM: 5800
  • Balanced: External
  • GM Warranty

    Chevrolet Performance 12496963

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