The J.M. Striker Head is the first and only head of its kind. J.M. used over 15 years of racing head experience to develop the Striker Head. J.M. realized the Viper is a superior car that needed a superior cylinder head. The Striker head will meet and exceed an impressive amount of abuse that any Viper owner can place on it. From street, to road race, to radical drag racing there is a Striker head option for you. The JM Striker Head for the Dodge Viper accommodates both Gen-2 and Gen-3 engines.