GM LS Dished Piston Set 4.070 Bore -20cc

The GM LS Dished Piston Set 4.070 Bore -20cc from Race Tec Pistons is a precision-engineered solution tailored for high-performance LS engine builders and enthusiasts. This piston set is particularly beneficial for those pursuing aggressive compression ratios in forced induction applications, where managing combustion chamber volume is crucial for optimal ignition timing and detonation control.

Manufactured from premium aluminum alloy with precision-forged construction, these pistons are designed to withstand extreme cylinder pressures and thermal stress. The -20cc dish geometry effectively reduces total displacement and compression ratio, making it ideal for turbocharged or supercharged builds that require lower compression to prevent knock while maintaining power output. This design also enhances ring seal and optimizes combustion chamber shape for improved flame propagation.

These pistons are best suited for LS1, LS2, LS3, LSX, and LS9-based engines, allowing builders to tune their compression specifications effectively. The geometry of the pistons is particularly advantageous for applications running 91-93 octane pump fuel, ensuring reliable performance under boost conditions.