Description: High performance cast iron heads from GM Performance Parts. These Phase 3 cast iron Bowtie heads from GM Performance will outflow any production-style cast iron head. Intended for off-highway use only, the Phase 3 Bowtie heads offer extra-thick castings for you to experiment with port modification. These Phase 3 Bowtie cast iron heads are designed for the all-out competitive racer who(more)

Description: High performance cast iron heads from GM Performance Parts. These Phase 3 cast iron Bowtie heads from GM Performance will outflow any production-style cast iron head. Intended for off-highway use only, the Phase 3 Bowtie heads offer extra-thick castings for you to experiment with port modification. These Phase 3 Bowtie cast iron heads are designed for the all-out competitive racer who must run a production-style cast iron head. (minimize)