Muscle Head Stage V: Program V3-P3-F12, 2.400" x 1.900" Valve dia, 102cc chambers. Std Copper intake valve seats, B5 Exhaust valve seats, .025" Jr Hoops, 5/8" Top Row & 9/16" Bottom Row Head stud inserts. 2.600" lifter spread, 12ø Exhaust Flange. (pr)