Your in-and-out experience is another reason I always adjust valves with the engine running. Sure, its sloppy, makes a mess and you can only do about half per session, but it for-sure gets them correctly adjusted. Seems that even with 5 decades of practice (hydraulics and solids), I still can't get all 16 correctly set cold so that when the engine's hot they're also correct. After running the engine until the gauge says its hot, pull a valve cover and tug on the rocker arms- you'll likely find one thats tight and one thats loose (at least!)
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