JE Pistons GM LS 4.030in Bore .030 Oversize -8.6cc Asymmetrical FSR Dish/Inverted Dome - Set of 8As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons for domestic applications. Engineered, forged and machined 100% in the USA, JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From dirt track to drag strip, JE Pistons? performance is proven in victory lane time and time again.