[GOSFAST]

With respect to "butt-grinding" the stems to set the clearance (lash) most valve grinders have the attachment to get this done. I'm certain any shop could finish-size them (lengthwise) once you have all the measurements established. If your numbers are correct it should be fairly straight-forward.

I've mentioned using the lash caps for some time now, the real "positive" using this method (where longer valves may work better) is the fact there is no adverse effect on the spring/retainer/lock setup! We've been using lash caps for over 40 years now on the Flathead platform. Not one single issue ever. Basically they add around .080" to the valve length without affecting the final spring height dimensions.

(Add) We also haven't had a single adjuster "loosen" on any build here, but we still use nothing but the original "Johnson" tappets!

Thanks, Gary in N.Y.

P.S. Here's a shot of some 1929 Chev valves being done on the stem ends, not so much for size (length) on this application but to make certain all is "square" on the tops.