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GM Performance 425 Horsepower ZZ383 Long Block, SB Chevy Engine

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Rear Main Seal Style:
Camshaft Type:
Hydraulic Roller Tappet
Piston Material:
Hypereutectic Aluminum
Crankshaft Material:
Forged 4340 Steel
Cylinder Head Material:
Crate Engine Type:
Long Block
Connecting Rod Material:
Powdered Metal
MFG. Part #:
Maximum RPM:
Engine Displacement:
GM Performance 425 Horsepower ZZ383 Long Block, SB Chevy Engine

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Please note the following about this product:

  • This product is discontinued.


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What's in the Box


The all new ZZ383 offers Big Block performance with a Small Block price tag.

GMPP starts with the legendary Fast Burn cylinder heads and the 383cid bottom end, to offer an incredible 460 ft. lbs. of torque @ 4500 rpm with a smooth, linear delivery. The combination of a 3.800 steel crank and a stout .509/.528 lift hydraulic roller camshaft produces 450hp @ 5400 rpm, making the ZZ383 the benchmark by which all other 383cid small blocks will be measured.

GM's testing was completed using a GM single-plane intake manifold, a 750cfm Demon mechanical secondary carb, and 1-3/4 primary x 33 length headers with a 4 collector. A dual-plane intake manifold can be used, but will affect overall peak performance numbers by 15-20 HP.

  • Power: 450 HP @ 5400 RPM, 449 ft. lbs. of torque @ 4500 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: 12625033
  • Balance: External
  • Maximum GM Recommended RPM: 6000
  • Ignition Timing: Base 10 degrees BTDC, 32 degrees total
Engine Includes:
  • Fully GM assembled long block
  • Black Aluminum Valve covers
  • GM Eliminator Single Plane Vortec Intake Manifold
  • Oil pump, pick-up and oil pan
  • 12-3/4” Auto Trans Flexplate
  • 8” Harmonic Balancer
  • Front timing cover
  • Cast Iron Long Water Pump
  • Oil Filter and Adapter
  • Passenger Side RH Oil Dipstick and Tube


General Motors limited 2 year / 50,000 mile parts & labor warranty.

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