5/8″ Head Bolt Washer Insert: 1.100″ Flange OD x .790″ Press dia x .650″ ID, Boron Infused. (each)

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)