Muscle Head Stage IV: 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, 12* Exhaust Flange.(pair)

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