60587 - Edelbrock Pontiac Performer RPM NHRA Legal Heads Details
A356 aluminum casting with 5/8" thick deck
172cc Exhaust port volume
Fully adjustable 7/16" stud and guide plate valve train (3/8" pushrod recommended)
Maganese bronze valve guides and ductile iron interlocking valve seat
Heli-coil inserts in critical areas, including rocker stud and exhaust flange bosses