JE Pistons SBC FSR TOUR SERS GP Set of 8 Pistons

Engineered, forged, and machined 100% in the USA, JE Pistons are designed for specific engine and racing applications to provide the ultimate combination of durability and performance. This set is for Chevrolet Small Block (SBC) applications, with a 4.045" bore, 3.500" stroke, and 6.000" rod length. They are flat top pistons with a -5.0cc dome volume, weighing 367 grams (per piston). The FSR Tour Series GP is a lightweight piston design specifically made for naturally aspirated circle track or drag race applications up to 650 HP. Ring package has been raised for maximum efficiency. These pistons are an aggressive, competition-only design, not intended for street or nitrous use. Ring grooves are precision machined for .043, .043, 3.0mm rings. Valve reliefs will accommodate angle-milled aftermarket cylinder heads.