Some of these heads are not Closed Chamber Heads like the 1967 670 cylinder heads. They were like a Semi Open Chamber Design. I have seen this before. As Pontiac was learning about the propensity to cheapen the fuel changes had to be made
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Title: Semi Open
Description: Some of these heads are not Closed Chamber Heads like the 1967 670 cylinder heads. They were like a Semi Open Chamber Design. I have seen this before. As Pontiac was learning about the propensity to cheapen the fuel changes had to be made
