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ZZ383/425 425 HP 383 Small Block Crate Engine with Aluminum Heads
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.
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 9.7 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: 13/4" primaries, 33 inches long with a 4-inch collectors. GM dual plane intake P/N 12366573 may be used for hood clearance on the ZZ383/425, but it results in a decrease in peak horsepower of approximately 15-20 horsepower.
Block: 9.7:1
Camshaft Duration @ 0.050 in. I/E: 222 / 230
Camshaft Type, Lift in. (I/E): Hydraulic Roller, 0.509 / 0.528
Crankshaft: Forged Steel, 3.800 in. Stroke
Heads, Chamber Size: Fast Burn Aluminum, 62cc
Horsepower: 425 @ 5400 RPM
Intake Manifold: Not Included
Torque: 460 ft/lbs @ 4500 RPM
Valves (I/E) (in.): 2.000 / 1.550
Average Customer Review: 
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ABSOLUTELY AWSOME!!!, |
April 15, 2008 |
| I installed this engine in my '54 Bel Air and it is an incredible performer. More power than I imagined and gets fairly good milage. |
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zz 383 everything promised and much more, |
April 11, 2008 |
| I installed a zz383 in a customers truck. Edelbrock performer rpm air gap, edelbrock 750 cfm. It has an excellent idle and incredible power. I would recommend a zz383 to anyone who loves to feel torque and power. |
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383 small blocks rule, |
March 23, 2009 |
| these small blocks are perfict for any application. To a big block, there is no comparison with weight to power, money, and streetable power. |
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zz 383 everything promised and much more, |
April 11, 2008 |
| I installed a zz383 in a customers truck. Edelbrock performer rpm air gap, edelbrock 750 cfm. It has an excellent idle and incredible power. I would recommend a zz383 to anyone who loves to feel torque and power. |
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zz 383 everything promised and much more, |
April 11, 2008 |
| I installed a zz383 in a customers truck. Edelbrock performer rpm air gap, edelbrock 750 cfm. It has an excellent idle and incredible power. I would recommend a zz383 to anyone who loves to feel torque and power. |
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awesome engine, |
April 20, 2007 |
| I have this engine in my 78 chevy pickup(3900 lbs) and it runs 12.44 in the quarter mile. It is also sometimes my daily driver! Amazing amount of torque. |
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great engine, |
April 10, 2007 |
| I have had this engine for about 3 years in my vette (1981). I have put now on it an super ram injection what makes it more smoother.
Anyway the engine is superb. |
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ok, |
October 13, 2008 |
| the motor is ok but lackes power i think i will continue to run the big block chevy motors |
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GOOD BANG FOR YOUR BUCK!!!!!!!!!!!!!!!, |
January 27, 2008 |
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