cart (0)
check out
wish list
SEARCH    specialsperformancerestorationaccessoriesmerchandiseAftermarket
Search Results of Available Items
*Prices are Per Unit

Page 1: 1-1 of 1 items     

12498772 - ZZ383 CRATE ENGINE

GM PART # 12498772 *
CATEGORY: Eng Asm (shipped only to local UPS hub for pickup)

List Price:$6,882.50
You Save: $146.85 (2%)

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
Camshaft 12370846
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 32ยบ total @ 3000 RPM with vacuum advance disconnected

This engine includes shipping to your local UPS freight hub for pickup. If you wish to have the order shipped to your billing address, please also order part number AD200, for the additional delivery fee.

Page 1: 1-1 of 1 items     
* This part has been replaced by a new part number. The new part number will be used if you add this part to your cart.

NOTE: carries 380,000 GM parts. Due to the number of parts available, the part you are searching for may not appear in these results. Please use our Customer Service page if you need help locating a GM part. Can’t find a part?
^ Back to Top ^

©1999 - 2015 Flow GM Auto Center - All Rights Reserved. is independently owned and operated by Flow GM Auto Center,
an authorized independent reseller of General Motors Parts. This site is not owned or operated by General Motors Corporation.
Privacy Statement | Site Policies | Warranty Disclaimer
We accept VISA, MasterCard, and PayPalGM Certified Internet Dealer