Chevrolet Performance Parts

The Chevrolet Premium ZZ383/425 delivers the maximum big-block power from a reliable small-block engine while still maintaining pump 92 octane gas capability. This fully streetable small-block package has show class appearance with it’s quality chrome valve covers, oil breather, and oil filler cap.
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Updated 08-08-2006.
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383CI STROKER ENGINES NAVIGATION

GMPP HT 383 Main Page	GMPP HT 383 Pictures
GMPP HT 383 Parts List	GMPP HT 383 Partial Engine
GMPP ZZ383/425 Main Page	Chevrolet Premium ZZ383/425 Main Page
Chevrolet ZZ450 Main Page	Chevrolet ZZ450 Pictures
Chevrolet The SBC 50th Anniversary.	Chevrolet ZZ383-500
Chevrolet ZZ383-500A Pictures	Chevrolet ZZ383-500 Pictures
Chevrolet ZZ383-500 Options Photos	Chevrolet ZZ383-500 Parts Photos
We have more GM and Chevrolet Performance Engines available. We have more GM Stock Replacement Long-block Goodwrench Engines available. We have more “Gen 3” and “Gen 4” Design Engines available. (LS1, LS2, LS6, LQ4, LS7)

PREMIUM ZZ383/425 DESCRIPTION

Chevrolet’s Premium ZZ383/425 P/N SC383PE

     With GM’s legendary Fast Burn cylinder heads, 383 cubic inches, and the Street Avenger 770cfm carburetor, the Premium ZZ383/425 delivers the torque and smooth delivery most people demand surpassing the GMPP ZZ383/425’s capabilities. With 450 horsepower at 5600 RPM and 488 ft.lbs. of torque at 4400 RPM, The Premium ZZ383/425 makes a fantastic street rod engine. The Chevrolet Premium ZZ383/425 isn’t just a more completed version of the GMPP’s ZZ383/425, but takes the engine one performance level higher with better overall performance. The complete parts package of the Premium ZZ383/425 gets the maximum performance out of the ZZ383/425 while still maintaining the compression ratio of 9.7:1, capability of running off of premium pump 92 octane fuel and maintaining the ZZ383/425’s long lasting reliability.
     Chevrolet improved the air flow and performance of the GM ZZ383/425 with the use of the Edelbrock Air Gap intake and Holley’s Street Avenger 770cfm carburetor and suggest the use of a high quality low resistance paper or foam air filter along with the appropriate 1-3/4” tube headers for the Fast Burn heads to maintain the air flow characteristics of this engine and it's performance.
     An Edelbrock aluminum water pump and intake manifold where chosen to keep the overall engine weight down, beside the proven performance of each in street/strip and racing engines.
     Adding the Proform chrome valve covers with the Chevrolet name and Bow Tie, the Proform chrome breather and oil filler cap, high quality red spark plug wires with your choice of logos, and stainless steel wire looms with the Chevy Bow Tie cut out, give the Premium ZZ383/425 it's striking showroom appearance.

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PREMIUM ZZ383/425 TECHNICAL INFORMATION

Parameter	Specification
ZZ383/425 Parts
Horsepower:	450 @ 5,600 RPM
Torque:	488 @ 4,400 RPM
Max. Rec. RPM:	6,000 RPM
Comp. Ratio:	9.7:1
Partial Engine:	P/N 12499106, 383ci
Block:	P/N 88962516, Cast Iron, Four Bolt Main, 383 Stroke
Crankshaft:	P/N 12489436 Forged 4340 Steel
Connecting Rods:	P/N 12497624 Stroker PM
Pistons:	P/N 12499103 High Silicon .005” O/S
Piston Rings:	P/N 12499107 set .005” O/S
Camshaft:	P/N 12370846, Hydraulic Roller, Lift (.509” I, .528” E), Duration @ .050” (222° I, 230° E)
Timing Chain:	P/N 14088783, Single Roller Design
Timing Cover:	P/N 12562818
Lifters:	P/N 17120735, Hydraulic Roller Valve
Cylinder Heads:	P/N 12464298, Cast Aluminum Fast Burn
Head Gaskets:	P/N 10105117, Composition, Stainless Steel Faces, .028” Compressed Thickness
Intake Valves:	P/N 12555331, 2.00”
Exhaust Valves:	P/N 12551313, 1.55”
Valve Springs:	P/N 12551483, LT4 Style
Valve Spring Ret.:	P/N 24503856
Valve Caps:	P/N 10212808
Valve Spring Shims:	P/N 10212809
Valve Lash:	Hydraulic
Push Rods:	P/N 10046173
Rocker Arms:	P/N 12367345 1.5 Aluminum Self-Aligning Roller Rockers
Spark Plugs:	R44LTS For Street Or R42LTS For Racing, Gap .045” For HEI Distributor
Ignition Timing:	32° total @ 3000 RPM with vacuum advance disconnected.
Fuel:	Premium 92 Octane
Oil Pan:	P/N 12557558 5 Quart Camaro/Caprice
Oil Pan Gasket:	P/N 10108676
Oil Filter:	PF454
Damper:	P/N 12498008, Balanced 383 Stroker
Flex Plate:	P/N 14088765, 153 Tooth
Premium ZZ383/425 Parts
Intake Manifold:	Edelbrock P/N 7516 RPM Air-Gap Vortec (1500-6500 RPM)
Oil Fill Cap:	P/N 93439687 (Proform 141-630)
Valve Cover:	Proform Chrome P/N 141-132 (GM P/N 12497985). Other valve covers are available if you don’t like these. Call and ask our counter sales people for help in choosing a valve cover. Choosing an alternative valve cover may effect the total price of this engine if the cost of the valve covers you pick are not equal in cost to these valve covers.
Water Pump:	Edelbrock P/N 8810 Short Style Or Edelbrock P/N 8811 Long Style (Your Choice)
Air Cleaner:	Your choice of any Proform line of air cleaners except Proform P/N 141-790 and 141-793 carbon fiber air cleaners.
Oil Breather:	P/N 12341989 (Proform 141-616), Chrome, Push-In
Carburetor:	Holley, (0-80770) 770 CFM Street Avenger with electric choke.
Distributor:	P/N 93440806 GM HEI, Large Cap, Includes Coil. 01973681 Vacuum Advance Control Change (10°).
Starter:	P/N 10465293 - Starter, Factory Gear Reduction 153 Tooth, Remanufactured, using (1) 12338064 and (1) 14037733 mounting bolts. For 12-3/4” flywheel. Call and ask our sales staff for more starter, flywheel, and flexplate optional options.
Plug Wires:	P/N 12361057, 8mm Red Wire, GM Performance Parts Logo or 12361051, 8mm Red Wire, Chevrolet Bow Tie Logo. You choose which of the two you want.
Plug Wire Looms:	P/N 12496806, Stainless steel brackets with Chevy Bow Tie laser cut in the supports.

Note: Parts as well as prices and specifications are subject to change. Please call and talk to one of our parts sales persons prior to ordering for the most current information.

ADDITIONAL PARTS THAT WILL WORK WITH THE PREMIUM ZZ383/425

Flywheel: Like all small-block V8 engines produced since 1986, the Premium ZZ383/425 crate engine has a 3.00” diameter flywheel flange bolt pattern. Small-block V8 engines produced from 1958 through 1985 had a 3.58” diameter flywheel flange bolt pattern. This change in bolt circle diameter was made to accommodate a leak-resistant one piece rear main seal.

Pilot Bearing: You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing P/N 10461685 is recommended for this engine. This heavy duty bearing adds an extra margin of reliability to a high performance drivetrain.

Starter: The Premium ZZ383/425 includes a starter. The starter must be matched to the flywheel or flexplate diameter when installing the Premium ZZ383/425 engine. Small diameter flywheels are 12-3/4” and have 153 teeth. Large diameter flywheels are 14” and have 168 teeth. This difference in flywheel diameter requires two different starter housings. Starter noses used with 14” diameter flywheels have two offset bolt holes; starters used with 12-3/4” flywheels have bolt holes that are straight across from each other.
Starters that can be used with the ZZ383/425 are: P/N 10496870, 1876552, 14097278, 14097279, 10455709, 9000852, 14037733, and 12338064. Call and ask one of our counter sale people about your options for starter, flexplate, and flywheel.
Note - Chevrolet starter motors use special shoulder mounting bolts which register the starter on the block.

Carburetor/Air Cleaner: A 750 cfm four-barrel carburetor with either mechanical or vacuum operated secondaries and electric choke is recommended for the Premium ZZ383/425 engine at a minimum. Chevrolet includes a Holley Street Avenger 770cfm carb with electric choke with the Premium ZZ383/425
A foam or paper element, low restriction air cleaner should be used. The fuel mixture distribution can be upset if no diffuser is used, causing poor power and misfiring at high engine speeds. Always check for adequate hood clearance when installing a new air cleaner. GMPP has two chromed, 14” diameter, open element air assemblies for single four-barrel carburetors. P/N 12342079 has a plain top, and P/N 12342071 has a Chevrolet logo (see our Proform section). Both of these are supplied with a 3” tall filter element P/N 6421746 (AC P/N A212cw). A taller 4” element is available as P/N 8997189 (AC P/N A698c).

Fuel Pump: The Premium ZZ383/425 crate engine does not include a fuel pump. The fuel system must be capable of supplying adequate fuel volume at a minimum of 6 psi pressure when the engine is operating at wide open throttle (WOT). A high volume in-line electric fuel pump is available from GMPP P/N 25115899. This heavy duty pump flows 72 gallons per hour at 6-8 psi outlet pressure.

Spark Plugs/Spark Plug Wires: The Premium ZZ 383/425 crate engine comes with spark plugs P/N 5613611 (AC P/N R44LTS). If you are installing the engine in a vehicle originally equipped with a small-block V8 with HEI ignition, standard replacement spark plug wires can be used. A high performance 8 mm diameter wire set is included with the Premium ZZ383/425. Choice from ether the one with Chevrolet Bow Tie logo or GMPP logo. Also the GMPP logo wire sets are available as P/N 12361056 (135° spark plug boots) and P/N 12361057 (90° spark plug boots). The Chevrolet logo wire sets are P/N 12361050 (135° spark plug boots) and 12361051 (90°spark plug boots). The 135° spark plug boot set is recommended for routing the spark plug wires over the valve covers. The 90° spark plug boot set is recommended for routing the spark plug wires under exhaust headers. For extended highway use, you may want to upgrade spark plugs to 41-942 Dual Platinum P/N 25164048.

Valve Covers: The Premium ZZ383/425 comes equipped with chromed Proform 141-132, center hold-down valve covers. Call and talk to one of our Counter Sale people about selecting a different valve cover if you would prefer something else. A black composite center hold-down bolt LT4 type rocker cover is available (P/N 12552321 LH and P/N 12552322 RH). The Fast Burn Heads will also accept the older “Rim Mount” style valve covers, for those that prefer those to the newer style “Center Bolt” valve covers, and no adapter is needed because they designed for ether style valve cover to bolt right on.

Still Not Good Enough: Our Race Shop can customize the Premium ZZ383/425 to fit your needs all the way to a complete Turnkey engine ready to drop in. Our Race Shop is in-house for maximum quality control. We do not farm out our engine building to a third party like most on-line parts stores do. Call and talk to one of our Counter Sales people for details and warranty information on this engine. A complete price quote including shipping cost can be put together for you if you call and are seriously considering buying.

PREMIUM ZZ383/425 DYNO RESULTS

RPM	Torque	HP	RPM	Torque	HP	RPM	Torque	HP	RPM	Torque	HP
2514	443	212	3400	434	281	4300	486	398	5200	450	446
2600	443	219	3500	440	293	4400	488	409	5300	441	445
2700	444	228	3600	450	308	4500	484	415	5400	432	444
2800	442	235	3700	456	321	4600	482	422	5500	421	441
2900	440	243	3800	462	334	4700	476	426	5600	423	451
3000	435	248	3900	469	348	4800	473	432	5700	406	441
3100	434	256	4000	473	360	4900	468	437	5800	397	438
3200	433	263	4100	479	374	5000	463	441	5900	388	436
3300	434	272	4200	483	386	5100	457	444	6000	379	433
Note: Results were obtained using 93440806 GM HEI distributor, Holley 0-80770 carburetor, and Edelbrock 7516 intake manifold.