GM LS Piston Set 4.075 Bore -22.9cc.

The GM LS Piston Set 4.075 Bore -22.9cc from RACE TEC PISTONS is engineered for builders and engine specialists looking to optimize compression and performance in GM LS-series engine builds. This eight-piston forged set delivers the durability and precision required for both street and competition applications where combustion chamber volume control is critical. The dished piston design reduces compression ratio while maintaining structural integrity, making it ideal for naturally aspirated builds targeting specific displacement or boost-friendly configurations.

Each piston features a 4.075-inch bore diameter and negative 22.9 cubic centimeter dish, engineered to lower static compression and improve detonation resistance in high-boost or high-RPM environments. The forged construction provides superior strength compared to cast alternatives, critical for sustained power delivery and durability under extreme cylinder pressures. Ring groove specifications—1.5 x 1.5 x 3.0 mm—are precisely machined to accommodate OEM or upgraded ring packages, ensuring proper seal and minimal blowby. The complete set of eight pistons guarantees balanced assembly and eliminates the need for individual part sourcing.

This piston set is compatible with all GM LS-series engine platforms, including LS1, LS2, LS3, and LSx variants, making it a versatile choice for custom engine builds, engine swaps, and performance upgrades. Installation requires proper honing to the 4.075-inch bore specification and should be paired with matched connecting rods and crankshaft components for optimal balance and longevity. Engine builders and serious enthusiasts rely on RACE TEC PISTONS for consistent quality, dimensional accuracy, and the engineering precision demanded in high-performance and race applications.