Big Torque for Your Truck

Got a pre-1980 GM truck with a tired Small-Block? Forget the rebuild and take your trusty truck’s capability to the next level with our big-torque HT383 crate engine. Its extra displacement and unique parts are designed to build a wide, flat torque curve that maintains at least 400 lb.-ft. between 2,500 and 4,000 rpm. The 323 hp and 444 lb.-ft. of torque is power you simply won’t get with a stock-type rebuild.

Built for true truck strength, the engine starts with a cast-iron block with four-bolt main caps – a strength-enhancing feature most production truck blocks don’t have. We then fill the block with a forged steel crankshaft and a smooth hydraulic roller camshaft, then top it off with iron Vortec heads. Its 9.1:1 compression ratio is perfect for regular gasoline at all altitudes and engine loads.

We deliver the HT383 with an aluminum intake manifold, ready for you to swap over the accessories from your tired engine.


Power: 323 HP @ 4200 RPM, 444 ft. lbs. of torque @ 3000 RPM

Displacement: 383 CID

Bore x Stroke: 4.000” x 3.800”

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

Balance: External

Maximum GM Recommended RPM: 5000

GM Recommended Torque Converter 2400-2800 Stall

Ignition Timing: Base 10 degrees BTDC, 32 degrees total @ 4,000 RPM

Engine Includes:

Stamped Steel Black OE Valve Covers

Aluminum Performance Intake

12-3/4” Auto Trans Flexplate

8” Harmonic Balancer

Cast Iron Long Water Pump

Oil Filter Adapter

Passenger Side RH Oil Dipstick and Tube

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Small Block Chevy 383 323HP Base Crate Engine 19355720

Product Information

  • $5,252.59

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