When the championship is on the line, only the best will do. With over 70 years in the piston business, JE has been producing pistons for NHRA racing since the birth of the series, and that experience has helped to develop an exceptional line of NHRA approved Stock Eliminator parts. All pistons are designed, forged, and machined 100% in the USA and utilize our strongest 2618 aluminum alloy. NHRA approved pistons can be ordered up to .070in larger bore diameter than stock and are made-to-order. Ring groove dimensions as well as certain other parameters are designed as mandated by NHRA rules.