5.3 Semi-Hemi V-8 Billet Cylinder Heads, 2.700″ x 2.050″ valve dia, 102cc chambers. Std Copper valve seats. Billet 6061 with water jackets. (pair)

Muscle Head Stage V: Program V3-P1-F12, 2.450″ x 1.900″ valve dia. 102cc chambers. Std Copper intake valve seats, B5 Exhaust valve seats, .025″ Jr Hoops & 9/16″ Head stud inserts. 2.600″ lifter spread, 12ø Exhaust Flange. (PLR only)(pair)