Specially tuned for torque, the all new, Special Build, Pace HP383 delivers great power for trucks and heavy cars in a small-block package.
With its 3.80" stroke and Vortec cylinder heads the HP383 makes awesome torque, down low where you need it for towing or four wheeling off road.
Peak torque is 460 Ft/Lbs at 3600 RPM, but even more Impressive, the Pace 383 IS churning 375 Ft/Lbs by only 2900 RPM !
Developed as a high torque engine, with a low end torque grind roller cam, heavy duty forged powdered metal connecting rods, forged crankshaft and hypereutectic pistons the Special Pace HT 383 is designed to be worked. 406 horsepower at 5300 RPM doesn't hurt either. The HT 383 should only be used in 1979 and earlier pre-emissions street vehicles or any year off road vehicles.
Power: 406 HP @ 5200 RPM, 460 ft. lbs. of torque @ 3600 RPM
Displacement: 383 CID
Bore x Stroke: 4.00” x 3.80”
Compression Ratio: 9.1:1
Recommended Fuel: 87 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: . 0.473" intake / 0.473" exhaust
Cam Duration @ .050”: 215 deg. Intake / 223 deg. Exhaust
Lobe Separation: 109 Degree
Cylinder Heads: Cast Iron Vortec, 3/8” pressed-in rocker studs
Combustion Chamber: 64cc
Valves: .194” Intake/ 1.50” Exhaust
Rocker Arms: Roller Rocker, 1.5:1 Ratio
Valve Springs: 10212811
Maximum GM Recommended RPM: 5000
Ignition Timing: Base 10 degrees BTDC, 32 degrees total
• Pace engine prep and oil priming service.
• Fully GM assembled long block
• Stamped Steel Black OE Valve
• Oil pump, pick-up and oil pan
• Aluminum Performance Intake
• 12-3/4” Auto Trans Flexplate
• 8” Harmonic Balancer
• Front timing cover
• Cast Iron Long Water Pump
• Oil Filter Adapter
• Passenger Side RH Oil Dipstick and Tube
• Holley Performance Ultra Street Avenger 670 CFM carburetor
•Black 14 inch air cleaner assembly
• Includes Oil Filter and Pace Performance recommended break in oil: Shipped in Pan
General Motors limited 1 year parts only.