I just used the Harley Davidson on my rs's. From what I remember I had to make the whole a little bit bigger. Not that big of a deal. But I had wider 45deg lips from BFI. GL with your build.
I ran a search for valve stems in this section as well as google but I got a lot of different numbers and no solid information.
i measured the holes on two lips that i will be using, as well as the width of a valve stem currently mounted on another two lips.
The first pair (.5 inch lip) has an actual hole between 5 and 6mm with a recession about 11mm in diameter.
The second pair (1 inch lip) has the valve mounted on it and it's around .545 inches which comes out to about 13.8 mm on the outside.
I'd like to change all 4 stems to hard stems (not the ones in the second picture. I hate those). I just don't know what size to order. i am looking at BBS' hardware PDF
Between page 9 and 10, i am unsure of what stems to order. I have read that i can order them from Tirerack, BFI, or even Harley Davidson.
All 4 lips are OEM bbs lips, so should i just order these "narrow valve stems" from BFI and call it a day?
thanks for any help and sorry for all the links!