481-X Stage II Billet Cylinder Heads, 45* Valve seats. Specify program #. 2.400″ x 1.900″ Valve dia. .051″ dia O-Ring wire, 1/2″ dia Head Studs. (pair)

Muscle Head Stage V: Program V2-P8-F12, 2.490″ x 2.020″ valve dia, 104cc chambers. Std Copper intake valve seats, B5 Exhaust valve seats, .025″ Jr Hoops & All 9/16″ Head stud inserts. 2.600″ lifter spread, 12ø Exhaust Flange. (pair)