Designed for 1965-79 389-455 c.i.d. Pontiac engines Patterned after the 1969-70 Ram Air IV Pontiac cylinder head 72cc version is for higher compression engines Made in USA
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
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