Diamond Turbo/Blower Pistons for Small Block Chevy can be used in forced induction applications up to 20 lbs. of boost and designed to fit most 23 Degree cylinder heads. Ratios are configured @9.000" deck height. Standard 1/16" x 1/16" x 3/16" ring package (Rings not Included). Full round skirt design for premium strength. Premium H-13 wrist pins included. Gasket volume = 9.0cc, top ring down= .240" to .300", valve relief depths = .295" intake and .200" exhaust. Will Support up to 1200HP.