[Walt Fricke]

Wayne's book on 911 engine rebuilding does not give a torque spec, at least not that I could find. I think he covers valve adjustment in 101 Projects, but I can't find where my copy of that went. Anderson doesn't mention torque for these. My Bentley for the 3.2s is silent on these.

The normal method of tightening these nuts is to hold the shaft in position with a big screw driver, and to tighten the nut with a box end wrench. Short of using a crow's foot, you won't be able to use a torque wrench for this anyway. And you'd need something a bit offset, as the valve cover studs get in the way.

This is an M8/1.00 bolt. Per a chart Maryland Metric has on their website/catalog, if these are 8.8 grqade, they can be torqued to 38 N/M, which is 28 lbs/ft. If 12.9, 52/38. This is higher than one sees in specs for these parts, though. If one were to go by that alone, you wouldn't expect that 20 lbs/ft would distort threads on the nut or screw or the rocker. I've accumulated maybe 50 spare rockers in various conditions and stages of being reconditioned, and for sure sometimes it is very hard to get the screw part out of the rocker. I take that to mean it is the rocker threads which distort. Perhaps that cast metal, in a place where it can't conveniently be hardened, is the weak link and the source of distortion? However, you striped the adjuster threads.