Agree, you need to make sure that the "D-Port" applies to Factory Pontiac Cast Iron "D-Port" heads.
I am reading that it applies to aftermarket "D-Port" aluminum heads or to Factory 455 HO and RA-IV Round Port heads as well as Aftermarket Round Port heads.
(No RA-V heads or stock cast iron street type Pontiac Heads).
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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