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I got the inner diameter of the SI 4ag valve guide off the SI website. The calculation I got that a 6mm reamer would pass through the SI without touching metal still seems good to me.
I forgot one thing to take into consideration.
A sheet of ordinary copy paper is 3/1000th" inch thick.
Figuring out the measurements in both inches and metric is too much for me. One or the other, but not both.
Good luck.
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