These Extreme X forged pistons are cylinder head specific and are fly cut for today's larger cams and bigger valves. They are available for two, three and four valve engines in the popular configurations necessary to meet displacement requirements ranging from 4.6 to 5.4 liters and common stroker / Big bore applications. A variety of crown configurations allow for compression ratios from low to high to meet the needs of supercharged, nitrous and normally aspirated usage. These already hi-tech pistons can also be upgraded with DSS’s patent pending skirt X groove which aids oil control, minimizes Fuel wash down cylinder damage and reduces piston scuffing by metering the oil to the thrust faces. Also ceramic coating can be applied to the piston crowns and a Teflon composite to the skirts for the absolute peak of piston performance. Contact www.dssracing.com 630-587-1169