Chevy ZZ4 350 Turn-Key Chevy Crate Engine

Packing a full 355 horsepower and 405 lb.-ft. of torque, the GM Performance ZZ4 350 Turn-Key crate engine includes a forged steel crank and LT1-style pistons and connecting rods along with a roller cam and other quality parts. The ZZ4 is a serious performer in any trim level. The Partial engine lets you build your own custom engine on a strong base block and major internals. GM Performance complete engines include: cylinder heads, lifters, timing set, camshaft, front cover, oil pump, oil pan, balancer and flexplate.

The ZZ4 Turn Key 350 comes with HEI distributor, cast iron water pump,an aluminum dual-plane intake manifold, damper and flexplate. This complete engine also has a host of other performance parts to finish the engine. Try on a Holley 750 CFM carb, starter, spark plug wires, chrome air cleaner kit, fuel pump, and accessory drive package with serpentine style setup.

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

Possible Applications*

  • A useful crate engine for any classic or muscle car
  • For a super cruiser
  • Add a professional, factory looking engine package to any classic.

*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: 12499712
Engine type: Chevy small-block V-8
Displacement (cu in): 350
Bore x stroke (in)cf6 : 4.00 x 3.48
Block (P/N 10105123): Cast iron with 4-bolt main caps
Crankshaft (P/N 12556307): Forged steel
Connecting rods (P/N 10108688): Powdered metal steel
Pistons (P/N 10159436): High-silicon aluminum with offset pins
Camshaft type (P/N 10185071): Steel hydraulic roller
Camshaft lift (in): .474 intake / .510 exhaust
Camshaft duration (@.050 in): 208'c1 intake / 221'c1 exhaust
Cylinder heads (P/N 12556463): Aluminum; 58cc chambers
Valve size (in): 1.94 intake / 1.50 exhaust
Compression ratio: 10:1
Rocker arms (P/N 10089648): Stamped steel
Rocker arm ratio: 1.5:1
Recommended fuel: 92 octane
Ignition timing: 10'c1 BTDC @ 800 rpm, cf0 32'c1 total @ 4000 rpm with vacuum advance disconnected
Maximum rpm: 5800

Chevy 350 ZZ4 Turnkey Crate Engine

Part #:12499712

Chevy ZZ4 350 dyno image

Installation Notes

  • Comes with 12.75" externally balanced automatic transmission flexplate; change to externally balanced flywheel for manual transmission applications. See chart on page 171.
  • Intended for pre-1977 street vehicles or all off-road vehicles.
  • Not intended for marine use.
  • Requires fuel line from fuel pump to carburetor.
  • Fuel pump pressure is pre-set, fuel pressure regulator not required.
  • Some assembly required.
  • NOTE: Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur.