Quote:
Originally Posted by Baron Von Zeppelin
Not a big issue , but something that can benefit you a little going forward when surrounded by other Pontiac-aholics .... the 13 Heads are open chamber - not closed chamber.
1967 was the last year PMD used closed chamber design on production heads.
Check your intake casting date.
Maybe get lucky and be 1969.
And carb number too.
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I looked at these heads before mounting them. They were closed chamber and the valves were (if memory serves) 2.0 something exhaust 1. 7 or 9 can't remember now. But seemed very large to me. I have the build date on heads and the intake.