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SP383 Base

SP383 Base

SKU: 19435450

The all new SP383 offers Big Block performance with a Small Block price tag. Chevrolet Performance starts with the legendary Fast Burn cylinder heads and the 383cid bottom end, to offer an incredible 445 ft. lbs. of torque @ 4600 rpm with a smooth, linear delivery. The combination of a 3.800 steel crank and a stout .509/.528 lift hydraulic roller camshaft produces 435hp @ 5600 rpm, making the SP383 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.

  • Horsepower

    435 HP

  • Torque

    445 LB-FT

  • Tech Specs

    Power: 435 HP @ 5600 RPM, 445 ft. lbs. of torque @ 4600 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, 36 degrees total @ 4000RPM
    Chevrolet Performance recommended converter stall 2400-2800
    Engine Includes:
    • Fully GM assembled long block
    • Black Aluminum Valve covers
    • Oil pump, pick-up and oil pan
    • Front timing cover
    • Cast Iron Long Water Pump
    • Oil Filter and Adapter
    • Passenger Side RH Oil Dipstick and Tube
    • GM Recommended Torque Converter Stall 2400-2800

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