4.9″ Bore Center NHRA Pro-Stock Cylinder Heads (pair)

Muscle Head Stage V: Program V3-P2-F12, 2.450″ x 1.900″. 102cc chambers. Std Copper intake valve seats, B5 Exhaust valve seats, .025″ Hoops, 5/8″ & 9/16″ HS inserts. 2.600″ lifter spread, 12ø Exhaust Flange. (pair)