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Chris:
I haven't done a ton of searching yet, but I've had a hard time finding any for 9 mm stems. Lots of non metric stuff for GM iron though.
I guessed they (or the stems) could be ground to size... I just got to wondering if the top hat shim needed to be hardened all the way through. With a machinable collet, they would be easy to make (even in steel at Rockwell 32-36). Not fun, but doable.
As for the DLC I've been told it's mandatory for a top end motor due to frictional losses by folks who instrument everything, but I personally don't have access to that data. DLC is pretty common nowdays, reasonably cheap, and will coat most metals.
After actually holding a 906 rocker and a cast rocker together it was a real surprise. I had read that they are lighter, but wow, what a difference. It's a crying shame that the darn things are so hard to find (or so expensive as a repop).
I hope you'll post pics of your rockers when you get them. Did you lighten them any or are they a direct copy?
t
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1967 912 with centerlocks… 10 years and still in pieces!
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