ATK GM 383 Stroker 375 HP HP33 Stage 1 Long Block

Description

The massive 383 stroked internal displacement of the ATK GM 383 Stroker 375 HP HP33 Stage 1 Long Block addresses restrictive factory cylinder pressure limits. Experience aggresive off-the-line torque during classic car cruising and towing. This build utilizes heavy-duty cast iron heads to output three hundred seventy-five horsepower smoothly.

Key Features of ATK GM 383 Stroker 375 HP HP33

• GM 4-Bolt Main Cast Iron Block: Features seasoned main bearing caps clamped with high-tensile fasteners to eliminate block flexing under load.
• Heavy-Duty Cast Iron Cylinder Heads (76cc Chambers): Offers robust structural reliability and increased thermal retention for dependable street performance.
• Scat Nodular Iron Stroker Crankshaft: Extends the piston stroke to 3.750 inches to generate massive low-end and mid-range torque.
• GM Powder Metal Connecting Rods: Absorbs severe combustion pressures safely to ensure long-term mechanical reliability.
• Hydraulic Roller Camshaft (.442″/.465″ Lift): Reduces internal valvetrain wear while producing a smooth daily-driven idle and flat power band.

Component Breakdown: Base Long Block Configuration

This assembled base long block provides a formidable small block foundation for high performance engine swaps and direct repowers.

• A precision machined cast iron block houses a robust hydraulic roller camshaft designed to deliver a massive torque curve for heavy street applications.
• Heavy duty cast iron cylinder heads improve overall thermal efficiency while thick internal bearings maintain steady oil pressure under load.

Vehicle Fitment & Compatibility Matrix

Engineered to drop seamlessly into classic Chevrolet engine bays this 5.7L block aligns perfectly with standard motor mounts. Sourcing one of our high-output Chevy small block engines modernizes the powertrain of your classic vehicle instantly.

• Fits 1967-1981 Chevrolet Camaro models looking for an authentic 383 power upgrade.
• Fits 1973-1987 Chevrolet C10 pickup trucks requiring a heavy duty replacement block.
• Fits 1964-1972 Chevrolet Chevelle platforms needing robust low end towing torque.
• Fits 1968-1974 Chevrolet Nova applications seeking a direct fit replacement.

Fuel & Ignition System Requirements (Tech Notes)

Feeding this classic small block engine demands proper fuel tuning and reliable ignition components.

• An upgraded mechanical or electronic fuel pump is required to supply your carburetor while utilizing 91 Octane premium pump gas prevents pre-ignition.
• Heavy duty spark plug wires must be utilized alongside an HEI distributor to maintain a powerful spark across the RPM band.

Installation, Break-In Oil & Priming Instructions (Tech Notes)

Proper initial startup procedures ensure the longevity of the hydraulic roller lifters and internal bearings.

• Transfer your existing intake manifold using fresh gaskets before manually priming the oil system with a dedicated priming tool until pressure is verified.
• Fill the crankcase with a high zinc break in oil and perform a varied RPM heat cycle before driving conservatively for the first 500 miles.

USA Warranty, Emissions & Logistics

Investing in this ATK High Performance crate engine secures peace of mind through comprehensive manufacturer backing.

• Backed by a strict 1-Year manufacturer warranty this engine provides excellent protection against internal manufacturing defects when installed properly.
• This assembly is not legal for sale or use on pollution controlled motor vehicles in California and ships securely via LTL freight.