Chevy ZZ502/502 Base Kit

GM Performance Parts built the ZZ502 Base engine as a partial short block engine assembly. They left the fun stuff for you to install. You get the assembled big-block V-8, four-bolt main short block. The Base Engine is a 4.47” bore that is stroked to 4.00”. It comes with aluminum, oval port cylinder heads with big 110 cc combustion chambers. The ZZ502 valvetrain features 2.25” intake and 1.88” exhaust valves to let it breathe easy! The crankshaft is forged steel and is paired up with a hydraulic roller camshaft for great performance. You add an intake manifold, carburetor, water pump, distributor and plug wires.

Possible Applications

  • Big-time horsepower
  • Big-block bracket racing
  • Massive Powerplant

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

Part Number: 12496963
Engine type: Chevy big-block V-8
Displacement (cu in): 502
Bore x stroke (in): 4.47 x 4.00
Block (P/N 10237292): Cast iron with 4-bolt main caps
Crankshaft (P/N 10183723): Forged steel
Connecting rods (P/N 10198922): 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'c1 intake / 234'c1 exhaust
Cylinder heads (P/N 12363390): Aluminum oval port; 110cc chambers
Valve size (in): 2.25 intake / 1.88 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: 8'c1 BTDC @ 800 rpm; 36'c1 total @ 5000 rpm
Maximum rpm: 5800

ZZ502 - 502 Base Kit Engine Image

Part #:12496963

zz 502 - 502 dyno image

Installation Notes

  • NOTE: Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur. GMPP distributor P/N 93440806 is recommended.
  • Clutch linkage boss is cast into block, but must be drilled and tapped. When using cast iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance.
  • Requires electric fuel pump because Gen VI block has no mechanical pump boss
  • Comes with a 14" automatic transmission flexplate.
  • Intended for pre-1977 street vehicles or all off-road vehicles.
  • Not intended for marine applications.