Chevy ZZ502 Deluxe Kit

This is a kit that you have to assemble. The ZZ502 is available as an assembled engine.

We know some of you like to put your own engines together. GM Performance put the kit together with quality parts to deliver an engine with 502 horsepower (one horsepower per cubic inch) and 567 lb.-ft. of torque. You know what you're building, because GMP dynoed this engine to make sure! It's a big block kit that you'll be proud to run in your car!

The ZZ502 deluxe kit starts with the base engine kit. GMP adds a Holley 850 cfm 4 barrel carb, starter, distributor, plug wires and water pump. When you build it and fire it for the first time, you'll be glad you went with a GM Performance engine package.

NOTE: Intended for pre-1977 street vehicles and all off-road vehicles. Not intended for marine use.

Possible Applications

  • Big 500 horsepower applications
  • Great drag racing foundation
  • A hot rod

*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.

ZZ502/502 BASE ENGINE TECH SPECS:
Part Number: 12371171
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; stain less steel
Compression ratio: 9.6:1
Rocker arms (P/N 12368082): Stamped steel
Rocker arm ratio: 1.7:1
Distributor (P/N 93440806): HEI type
Carburetor (P/N 12366996): 850 cfm
Water pump (P/N 14058915): Aluminum, short-style
Spark plugs & wires: Included
Starter (P/N 9000852): Included
Flexplate (P/N 10185034): 14"
Recommended fuel: 92 octane
Ignition timing: 8'c1 BTDC @ 800 rpm; 36'c1 total @ 5000 rpm
Maximum rpm: 5800

ZZ502 Deluxe Kit Engine Image

Part #:12371171

zz 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.
  • This is a kit and comes in pieces. You must install heads, valve covers, intake, carburetor, water pump, distributor etc.
  • Intended for pre-1977 street vehicles or all off-road vehicles.
  • Not intended for marine applications.