Ultra Series forged pistons from JE are the industrys strongest, most fully featured pistons available off the shelf. Offered for a wide range of domestic applications from LS to Big Block and HEMI to Ford Modular, Ultra Series pistons feature JEs proprietary Aligned Grain Flow forging technology providing next - level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with custom level features including thermal barrier crown coating, skirt coating, gas ports, and more, Ultra Series are the ideal pistons for your boost - heavy or nitrous - huffing V8 engine build. As with all JE Pistons products, Ultra Series pistons are made 100 in the USA.