Just a thought. How you adjust valves is less important than Why you adjust them. Any technique that gets it done is a good one. Too tight is bad. Too loose is noisy but less bad. Some engines are more fussy. Some are more forgiving. That includes engines that are the identical in other regards. For my self I do the final adjustment with a fully warm engine at as low an idle as I can get. But that does not mean the other ways are bad. What is the best way? Any way that gets the job done right. One type open and the other adjusted...fine you are on the heel of the cam. Just where you want to be. #1 on compression and do the loose ones then # 6 on compression and do the rest...fine you are on the heel of the cam. Running at a low idle...you have just used the dynamics of the engine to help set the proper clearance...fine as well.Why I do it running? Because I don't need to know if there is wear on the shaft. I don't need to worry about wear at the rocker or the valve stem. All of that is right there in plain sight if you will. Just as quiet as you can with no missing. Lets me worry a bit less and gets me back on the road. And my feeler gauge lasts a bit longer. I still set with a gauge if I have taken any thing apart. I still use the gauge if there are any new parts. I still use the gauge for cold and first starts. Just running to see if I can get it quiet and make sure that valve is on the seat.
