Quote:
Originally Posted by Jackstand Queen
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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Well, your SI valve guide inner diameter was correct, but your oem valve guide inner diamteter was way off (at least for measured use). And yes, the BGB recommends to use a 6mm reamer for new oem valve guides, as they must need reaming to make them the correct size. But who is to say that the SI guides need reaming, and not just honing. And since when will a 6mm reamer pass through a 5.99948mm hole without touching metal?
Just stick to millimeters and use all of the measurements I supplied. they all add up exactly as they are supposed to.