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JE Pistons Ultra Series GM Gen III/IV LS 4.075in Bore/4in Stroke Set of 8 Pistons turn14-in-stock Brembo 23+ Z (RZ34) FrontManufacturer Part # : 360773 Market Description Ultra Series forged pistons from JE are the industry? s 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 JE? s proprietary Aligned Grain Flow forging technology providing next level tensile strength ideal for the extreme cylinder pressures of power adder engine