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GMP-19301295-8STK - Chevrolet Performance ZZ383 450HP Engine with 8-Stack EFI

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

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Great looks and an EFI system that outperforms a carburetor

We took the new 8-Stack fuel injection system, mounted it on a brand new Chevrolet Performance ZZ383 and then added a FAST EZ-EFI ECU and harness. The Dyno results were surprising with 450HP @ 5200 RPM. More surprising was the tight air fuel ratio reading which stayed between 13.3 & 13.6 throughout multiple pulls on the dyno. During pull number 2 the FAST system started learning and making self adjustments which further enhanced the engine's performance. This fuel injected ZZ383 is one of the most efficient performance small block Chevy engines in our stable. We plumb the injection system with the new TechAFX premium fuel injection hose and fittings to provide you with long term reliability and each of these ZZ383 engines get dyno tested to insure proper engine break-in and trouble free installation.

Power: 450 HP @ 5200 RPM, 475 ft. lbs. of torque @ 4300 RPM
Displacement: 383 CID
Bore x Stroke: 4.00” x 3.80”
Compression Ratio: 9.6:1
Recommended Fuel: 92 Octane
Block: Cast Iron, 1 piece rear seal, 4-bolt main caps
Crankshaft: 4340 Forged Steel
Connecting Rods: HD Powdered Metal Steel
Pistons: Hypereutectic Aluminum
Camshaft: Steel Hydraulic Roller Tappet
Cam Lift: .509” Intake / .528” Exhaust
Cam Duration @ .050”: 222 deg. Intake / 230 deg. Exhaust
Lobe Separation: 112 Degree
Cylinder Heads: GM Fast Burn Aluminum Dual Bolt Pattern, 3/8” screw-in rocker studs
Combustion Chamber: 62cc
Valves: .200” Intake/ 1.55” Exhaust
Rocker Arms: Aluminum Roller, 1.5:1 Ratio
Valve Springs: 12551483
Balance: External
Maximum GM Recommended RPM: 6000
Ignition Timing: Base 10 degrees BTDC, 32 degrees total

Engine Includes:
• Fully GM assembled long block
• Polished Finned Cast Aluminum Valve Covers
• FAST EZ-EFI Multi Port System
• FAST Performance Electric Fuel Pump
• As-Cast 8 Stack Fuel Injection System
• MBI Distributor, Plug Wires, Looms and Spark Plugs
• Oil pump, pick-up and oil pan
• 14” Auto Trans Flexplate
• HD High Torque Starter
• 8” Harmonic Balancer
• Front timing cover
• Cast Iron Long Water Pump
• Oil Filter and Adapter
• Passenger Side RH Oil Dipstick and Tube
• Intake Height is 13-1/4" (measured from end rail of block to tops of stacks)
• Dyno tuned, break-in procedure and dyno sheet

General Motors limited 2 year / 50,000 mile parts & labor warranty. Click on Document tab above for full details.

Related Engines:
12499106 GM 383 Short Block
GMP-12498772-5R Fully Assembled ZZ383 425HP Engine
GMP-12496430-1 Fully Assembled ZZ430 350CID 430HP Engine

Application List



  • GMP-19301295-8STK
  • GMP-19301295-8STK
  • PACE Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 500.0 lbs.
  • FREE 48 State Shipping

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