Chevy ZZ383
For the ultimate GM Performance Parts small-block crate engine, choose the ZZ383—a combination of Fast Burn aluminum performance heads and a 383" stroker small-block Chevy that can add up to 425 HP and 449 lb.-ft. of torque.
Built with low end torque in mind, the ZZ383 uses fast burn cylinder heads to flow more through large 2.00"/1.55" valves with special chambers. This combination helps build mid and high end power as well. The combination makes the ZZ383 a great all out performer!
ZZ383 engines have modified engine blocks and 3.80"-stroke crankshaft. This produces 383 cubic inches of rocking performance. The reciprocating assembly is comprised of heavy-duty components including a 4340, nitrided, and induction hardened forged crank. This engine builds 425 horses of great fun.
The ZZ383/425 gives you the power of a BBC with the size and weight of an aluminum-headed small-block crate engine.
Applications
- The perfect small-block
- 11-second starting point for a drag car
- A weekend racer
*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.
| ZZ383/425 TECH SPECS: |
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| Part Number: | 12498772 |
| Engine type: | Chevy small-block V-8 |
| Displacement (cu in): | 383 |
| Bore x stroke (in): | 4.00 x 3.80 |
| Block (P/N 88962516): | Cast iron with 4-bolt main caps |
| Crankshaft (P/N 12489436): | Forged steel |
| Connecting rods (P/N 12497624): | Heavy-duty PM steel |
| Pistons (P/N 12499103): | Hypereutectic aluminum |
| Camshaft type (P/N 12370846): | Hydraulic roller |
| Camshaft lift (in): | .509 intake / .528 exhaust |
| Camshaft duration (@.050 in): | 222'c1 intake / 230'c1 exhaust |
| Cylinder heads (P/N 12464298): | Fast Burn aluminum; 62cc chambers |
| Valve size (in): | 2.00 intake / 1.55 exhaust |
| Compression ratio: | 9.6:1 |
| Rocker arms (P/N 12367345): | Aluminum roller style |
| Rocker arm ratio: | 1.5:1 |
| Recommended fuel: | 92 octane |
| Ignition timing: | 32'c1 total @ 3000 rpm with vacuum advance disconnected |
| Maximum rpm: | 6000 |
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Part #:12498772
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. We recommend HEI distributor P/N 93440806.
- Requires addition of carburetor, ignition, intake manifold, fuel pump, water pump and starter (not included).
- 425-horsepower rating achieved during GM testing with high-rise single-plane intake manifold P/N 12496822 and a 750-cfm Demon carburetor with vacuum secondaries.
- GMPP dual-plane intake manifold P/N 12366573 may be used to avoid hood clearance problems, but peak power may decrease by approximately 15-20 horsepower.
- Comes with 12.75" automatic transmission flexplate. Requires 1986-1999 350-style externally balanced flywheel for manual transmission. See chart on page 171.
- Intended for pre-1977 street vehicles and all off-road vehicles.
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