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I've adjusted my valves twice, first time when I rebuilt the engine, then about 3 years later when I pulled the valve cover off to fix a minor valve cover gasket leak (I think I was bored that weekend). The second time I had a couple valves that needed tweeked a hair, the rest were good. Both times I adjusted the cold gap to .015". That's room temp. cold, not like.... 20 degrees F or anything like that. Then I also did a hot check, that's operating temperature with a temporary sidekick gas tank ( I used a coffee can ). In both cases, my hot valve gaps were all right-on spec @ .013", or so close to it that I couldn't do any better with the engine idling along. I think a guy can actually do a better job with valve adjustments when the engine is sitting still at room temp., then when it is hot and/or running. When I adjust valves, I turn the engine by hand through it's cycle, adjusting valves as I go, then crank the engine a few times with the starter, then check-em all again, and keep doing that until I am happy with them. I interpret that valve rocker hot/cold spec as an either/or thing, check cold, or hot, but don't need to do both..... but that's just me.
George
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