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19355720 - GM HT383 383CID 323HP 444 ft lbs Crate Engine

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Specially tuned for torque, the all new HT383 delivers great power for trucks and heavy cars in a small-block package.

With its 3.80" stroke and Vortec cylinder heads the HT 383 makes awesome torque, down low where you need it for towing or four wheeling off road.

Peak torque is 444 Ft/Lbs at 3000 RPM, but the HT 383 makes over 400 Ft/Lbs between 2500 and 4000 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 HT 383 is designed to be worked. 323 horsepower at 4200 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: 323 HP @ 4200 RPM, 444 ft. lbs. of torque @ 3000 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: .431” Intake / .451” exhaust
Cam Duration @ .050”: 196 deg. Intake / 206 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: Stamped Steel, 1.5:1 Ratio
Valve Springs: 10212811
Balance: External
Maximum GM Recommended RPM: 5000
Ignition Timing: Base 10 degrees BTDC, 32 degrees total

Engine Includes:
• 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

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


Shipping Information

  • Item Requires Shipping
  • 492.0 lbs.
  • W29.3000” x H39.8000” x L41.5000”
  • Free Shipping!
  • FREE 48 State Truck Freight Shipping (International shipping will require freight quote)

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