For Sale: ZZ383 GM Performance 383 Crate Engine-425HP
12498772 ZZ383/425 Crate Engine
With GM's legendary Fast Burn cylinder heads and 383 cubic inches, the ZZ383/425 delivers incredible torque with smooth, linear delivery. If you're looking for a small-block package that delivers big-block power, then you've found it. 425 horsepower at an incredibly low 5400 RPM, and 460 ft-lbs. of torque at 4500 RPM make this the ideal hot street engine or off road powerhouse.
The excellent air handling and combustion characteristics of the Fast Burn cylinder heads combined with the ZZ383/425's 3.800" stroke, make this engine the benchmark against which all other 383 inch small-blocks should be measured. And it's tough, too. The 4340 nitrided and induction hardened crank and unique forged PM rods see to that. The 9.1 to 1 compression ratio ensures that the ZZ383/425 is 92 octane pump gas friendly.
The ZZ383/425 gets a stout .509/.528 lift steel camshaft, with 222/230 duration at .050 lift. Hydraulic roller lifters and GM's time tested 1.5 to 1 roller rocker arms round out the valve train. And, of course, it has the Fast Burn head's lightweight stainless steel valves and retainers for reliable performance at extended RPM.
GM's testing was completed using a GM single plane intake, P/N 12496822 and a 750 CFM Demon carburetor with mechanical secondaries. Test header specs are: 1 3/4" primaries, 33 inches long with 4-inch collectors.
GM dual plane intake P/N 12366573 may be used for hood clearance on the ZZ383/425, but results in a decrease in peak horsepower of approximately 15-20 horsepower.
GM Crate Engines are horsepower rated to SAE Standards.
Technical Notes: ZZ 383/425 Technical Information
Horsepower 425 @ 5400 RPM
Torque 449 @ 4500 RPM
Max. Recommended RPM 6000
Compression Ratio 9.1:1
Partial Engine 12499106
Block 88962516 Four bolt main,
cast iron Crankshaft 12489436 Steel "4340"
Connecting Rods 12497624 PM rods
Pistons.005 O/S 12499103 High silicon aluminum
Piston Rings .005 O/S 12499107
Cylinder Heads 12464298
Head Gasket 10105117 (.28 thick)
Intake Valves 12555331 2.00"
Exhaust Valves 12551313 1.55"
Valve Springs 12551483
Rocker Arms 12370838 1.5:1 roller rockers kit
Tortional Damper 12498008
Flex Plate 14088765
Lifters 5232720 Flat Tappet
Spark Plugs R 44LTS or R42LTS for racing
Fuel Premium 92 octane or greater
Ignition Timing 32º total @ 3000 RPM with vacuum advance disconnected
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5927 NE Industry Dr.
Des Moines, Iowa 50313
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