.139″ Int Man Top O-ring Matl

Muscle Head Stage IV: Program V1-P1-F12, 2.550″ x 1.975″ valve dia. 103cc chambers. Std Copper intake valve seats, B5 Exhaust valve seats, .018″ Jr Hoops & All 9/16″ Head stud inserts. 2.00″ lifter spread, 12* Exhaust Flange.(pair)