GM LS Piston Set 4.010 Bore -19.7cc

The GM LS Piston Set 4.010 Bore -19.7cc from Race Tec Pistons is a professional-grade forged piston kit engineered for high-performance LS engine builds and competition applications. This eight-piece set delivers the precision compression geometry and durability demanded by engine builders, tuners, and serious automotive enthusiasts who rely on OEM displacement and boost-compatible pistons. The dished crown design and specific bore dimensions make these pistons ideal for forced induction and custom LS-series engine configurations.

Each piston features a 4.010-inch bore diameter with -19.7 cubic centimeter dished geometry, optimized to reduce compression volume and accommodate boost pressure in supercharged and turbocharged applications. The forged construction provides exceptional strength and thermal stability under sustained high RPM and elevated cylinder pressures. Ring groove specifications of 1.5 x 1.5 x 3.0 mm ensure proper seal integrity and reduce blow-by, critical for maintaining power output and engine longevity in competition environments. The complete set weighs 11.1 pounds and comes ready for installation with all eight pistons precision-matched for balanced operation.

This piston set is purpose-built for GM LS-series engine platforms, including LS1, LS2, LS3, and LS9 variants. Buyers undertaking full engine rebuilds, stroker assemblies, or custom compression tuning benefit from the controlled combustion chamber volume these pistons deliver. Installation requires proper honing and ring gap setup by a qualified machine shop or engine builder. Verify bore size compatibility with your specific LS block before purchase, as precise fitment is essential for reliable operation and peak performance.