1957 Pan HeadSTD Heads ,Shovel Casting, Shovel bolt pattern, dual spark plug, 3 5/8 big bore, "B"and1 9/16 intake, 3bolt exhaust, Hemi, Port and polished intake and exhaust, front head only Stage 4 Spring kit. Nitride valve stem 1.940" Intake 74, 80 CID, 1.75 Exhaust 74, 80 CID Titanium top collars. Jerigh frame 4" stretch, 38 degree rake with 200 tire. One of a kink chopper. 3" belt drive primary.