Fits 88″ to 95″ (1550cc) or 96″ to 103″ (1690cc) 3-7/8″ big bore conversion kits. Includes 0.036″ head gaskets with Fire-ringr; RCM (Rubber Coated metal) rocker box base gaskets; Vitonr valve seals; and includes all gaskets; seals and o-rings required for complete engine rebuild. Without primary gaskets.