|The information below reflects the research conducted by Pontiac enthusiast/ author Pete McCarthy, much of which is from his book, Pontiac Musclecar Performance 1955-1977, as well as information gathered from many other Pontiac enthusiasts world-wide. Information about PMD heads is still being gathered. What is apparent is that while Pontiac had policies and specifications, both seemed to fluctuate as need be to build engines and place them in passenger cars.
Chamber size of heads is given as an approximate CC as is static compression. When examining any Pontiac head today it requires an open mind. All chamber sizes should not be assumed but cc'd to confirm the chamber size. I wish to point out that Pontiac manufactured heads with push-in studs and screw-in studs using guide plates. Most if not all performance heads used screw-in studs. Today machinists can easily improve on any stock iron Pontiac head with the inclusion of hardened seats, screw-in studs, longer valves, taller installed height for after market springs working with high lift camshafts.
Porting remains a viable means of improving flow for increased power. Most importantly, one must know the overall condition of the heads before attempting any performance modifications. Be sure to have them cleaned and magnufluxed by a competent machine shop.
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