ATK GM 383 Stroker 500 HP HP55C Stage 3 Carbureted LB

ATK HP55C 500 HP Crate Engine Performance

ATK GM 383 Stroker 500 HP HP55C Stage 3 Carbureted LB engines deliver a massive high-performance crate engine solution optimized for aggressive muscle car and street-strip applications. This 6.3L 383ci stroker features high-flow aluminum cylinder heads and a precision-ground hydraulic roller camshaft to produce a verified 500 horsepower. Built on a seasoned cast-iron block and precision-balanced for internal and external vibration control, this Small Block Chevy (SBC) architecture is a direct performance fit for classic GM platforms like the Camaro, Chevelle, and Nova.

As a Stage 3 turnkey performance powerplant, the ATK HP55C arrives with a pre-tuned carburetor, intake manifold, and HEI distributor to significantly reduce installation time. While this unit includes essential components like the water pump, harmonic balancer, and spark plugs, builders will still need to provide their own flywheel and air cleaner. Backed by a professional 1-Year limited warranty, this high-horsepower stroker is designed for enthusiasts who demand elite mechanical displacement and valvetrain stability in a traditional SBC package for classic truck or street machine projects.

Key Features of ATK High Performance HP55C

• 6.3L 383ci stroker displacement delivering 500 horsepower performance.
• High-flow aluminum cylinder heads for superior thermal management.
• Hydraulic roller camshaft optimizes valvetrain duration and torque.
• Seasoned cast-iron block foundation for structural durability.
• Internal and external engine balance ensures smooth operation.
• One-piece rear main seal prevents common small-block oil leaks.
• Protected by a standard 1-Year professional limited warranty.

HP55C Include:

• Intake Manifold
• Carburetor
• Distributor
• Oil Pan
• Valve Covers
• Timing Cover
• Water Pump
• Harmonic Balancer
• Flexplate
• Spark Plugs
• Spark Plug Wires