If you’re looking for a small-block Chevy that makes big-block power, we’ve got the engine for you! 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 that adds up to 425 horsepower and 449 lb.-ft. of torque.

A carefully engineered balance of torque-producing bottom-end power and horsepower-inducing Fast Burn cylinder heads combine for the ZZ383/425’s stellar performance statistics. The Fast Burn heads have large 2.00"/1.55" valves and specially designed chambers that draw in lots of air and fuel, burning the mixture quickly and completely. It’s a combination that generates great mid- and high-rpm power, which, when combined with the 383 cubic inch displacement, creates an awesome all-around performer.

The ZZ383 has a specially machined engine block and 3.80"-stroke crankshaft, which produce 383 cubic inches of pure performance. The reciprocating assembly is comprised of heavy-duty components including a 4340, nitrided, and induction-hardened forged crankshaft, and unique, heavy-duty powdered metal rods. It’s 425 horses of bulletproof performance.

With the ZZ383/425, you get the power of a big-block with the size and weight of an aluminum-headed small-block. If you’ve never driven a car with a stroked small-block and the top end components to support it, now is your chance!

ZZ383/425 Tech Specs:
Part Number: 12498772
Engine Type: Chevy small-block V8
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° intake/230° 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
Rock arm ratio: 1.5:1
Recommended fuel: 92 octane
Maximum recommended rpm: 6000br> Balanced: External

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.

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