Speedmaster PCE305.1015.03 Chevy SBC 383 ci 6.0" Flat Top Forged Pistons

The Speedmaster PCE305.1015.03 is a set of forged pistons engineered for Chevy small-block (SBC) 383 cubic-inch engine builds. These flat-top pistons feature a 6.0" rod length and 4.030" bore diameter, designed to handle the demands of stroker and high-performance applications with forged-steel durability and precision manufacturing.

Flat-top pistons like these are ideal for builders seeking maximum combustion chamber clearance and reliable performance in forced-induction, nitrous, or naturally aspirated 383 cubic-inch engines. The forged construction delivers superior strength compared to cast alternatives, making them suitable for aggressive cam profiles, high boost pressure, and elevated RPM ranges. With a 1.100" compression height and 0.927" wrist pin, these pistons integrate into SBC blocks with direct fitment. Commonly used in street machines, race cars, and engine rebuild projects, they provide the foundation for durable, repeatable power in small-block Chevrolet applications.

Key Features & Benefits

• Forged Construction: Forged-steel pistons deliver strength and reliability for high-performance and high-boost applications.
• 6.0" Rod Length: Designed specifically for 383 cubic-inch stroker and modified SBC engine builds.
• Flat-Top Design: Maximizes combustion chamber clearance for boosted, nitrous, and high-compression builds.
• 4.030" Bore Diameter: Direct fitment for SBC 383 ci engine blocks with precision-engineered tolerances.
• 0.927" Wrist Pin: Standard small-block Chevrolet pin diameter for OEM and aftermarket rod compatibility.

Specifications

Ideal Applications

• SBC 383 cubic-inch stroker engine builds
• High-performance and race engine assembly
• Forced-induction (turbo/supercharger) applications
• Nitrous oxide-equipped engine builds