A know a guy is using older Pontiac heads and a modified intake on a 301 Turbo TA and he drilled and tapped the center holes (7/16 - 14 I think he said) and loctite'd a bolt in the hole and had them surfaced. They seal with no issues.
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'67 GTO 400 HO - Ram Air - 4 speed - 3.55 Safe T Track, A/C, PS, red fender liners
'78 Lemans - Drag car project
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