Pre 66 intake bolt modifications info neeed.

66fs said

That is one of the best intakes, back in the day. There were published mods for Super Stock to get the fuel distribution right at high rpm.

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Yes - I saw that all modifications pertained to a Thermoquad and not a 4150 ###
I just wanted to gobble up a 2x4 set up for the future offy made the 2x4 in a medium riser also but they dont cast them anymore so I guess I will just use the Port O Flow and be content.