Reply To: ’67 80 hp; hey, wait a minute.

[Don]

I am not saying the new jets were drilled out, am saying the old jets may have been drilled out….I am assssuming that the old jets have the larger holes, perhaps this is not the case. And yes, back then there was only one direction of fuel flow for fixed jets, so there was no need for “C” or “D” indicators. But, there have been many different styles of carbs used since then.
If your new jets have the larger holes, I would find a number 52 drill like Frank described, measure it, and see which jets are correct.
Good work on the jet screwdriver, it is nice when folks follow through on our advice….