SBF Dished Piston Set 4.040 Bore -20.4cc

The RACE TEC PISTONS SBF Dished Piston Set 4.040 Bore -20.4cc is a forged piston kit engineered for Small Block Ford engines demanding premium compression ratio control and durability in high-performance applications. This eight-piece set delivers the precision geometry and material integrity required for competitive engine builds, street performance, and specialized automotive work where OEM pistons fall short of performance demands.

Each piston features a dished crown geometry that reduces combustion chamber volume to -20.4 cubic centimeters, enabling builders to achieve tighter compression ratios essential for forced-induction setups, nitrous oxide applications, or maximum naturally aspirated performance. The 4.040-inch bore size accommodates overbore engine blocks, while the 1.5 x 1.5 x 3.0 mm ring groove configuration ensures proper ring sealing and controlled blow-by under sustained load. Forged construction provides superior strength and thermal stability compared to cast alternatives, critical for engines operating at elevated RPM or boost pressure. The complete eight-piston configuration eliminates the need for mixed parts, ensuring consistent performance across all cylinders and simplifying engine assembly.

This piston set addresses the needs of engine builders, performance shops, and enthusiasts restoring or modifying Small Block Ford platforms. Whether assembling a carbureted stroker, turbocharged street engine, or competition-ready build, the dished design and forged durability provide the foundation for reliable operation across diverse power-adder scenarios. The -20.4cc displacement reduction demands precision valve-to-piston clearance checking during assembly, making this a choice for builders with experience in high-compression engine development.

RACE TEC PISTONS positions these components as OEM-quality replacements for stock applications and as purpose-built upgrades for modified builds. Small Block Ford piston compatibility demands precise bore sizing and ring groove dimensioning; this set's 4.040-inch bore specification and groove profile integrate seamlessly with properly prepared blocks while delivering the compression geometry required for performance-level combustion control.

Specifications: Set of 8 pistons, 11.25 lbs total weight, 11.9 x 6.3 x 11.9 inches packaged dimensions, SKU RTP1000391, MPN 1000391.