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Thanks, that's what I was thinking, different expansion rates of different metals. Last year's thread on this stopped short of explaining exactly why the short stud clearance increased with warmup rather than decreased. My 62 Ghia has a long stud engine that was never converted, and I can confirm that the clearances get tighter with warmup: when I first bought the car I foolishly adjusted the valves to .006 and as it warmed up the valve clearance disappeared and the engine stalled itself. : O Scott 62 343, 65 361 Russ wrote: >>When the old heads expanded in the heat, the steel stud didn't expand as much, therefore the valve lash closed up as the engine got hotter. the later heads, the rocker arms moved with the head with heat expansion.<< ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/