Yes, I use a drill bit to make sure the hole is what it is supposed to be, afaik, there is no other way to measure the hole. I use #65 for the metering hole, #66 for the strainers and #30 for the top .119-.121 hole. If you want different metering hole let me know - but I would have to get bits for the new size.
From what I remember HM said the #65 was the smallest, means the jet can be always opened up to be bigger.
It will take me a week or so to get them done.
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The time frame is good for me, let me do some research on the hole size to find exactly what I want, and the last thing I want is to not get enough oil up in the heads and on the flip side too much oil.
I looked into just getting a scrap head and scavenging it, but for it to come with guaranteed parts I need I am not in the monetary position to take that chance.
I saw that the one was out of stock, and that is what sparked my original question as far as part numbers go