The last 6 cylinder Chevy I did was a Mercruiser in a boat, with hydraulic lifters. Those you do running. I also vaguely remember doing a 54 Chevy I had back in about 1963 but don't remember if it was running or not when I did it. I can remember doing a V-8 car (the F kind) of about 55 vintage with it running and it was a real mess, oil everywhere. Keep in mind that if I remembered the best way (I'm sure I knew it once) I wouldn't have asked. But somewhere between the Liberty V-12's and the 1896 McDuff one lunger, along with the Hercules', Packards and all the others I've lost a beat or two. A few years ago I had to help the Ford dealer pull and send out a front main on an A model to be re-babbited, then reinstall it. They didn't have a mechanic old enough to know how. I had my drivers license several years before the 61 was made but was out of the auto business long before they needed work. I can still drive a 3 pedal model T, a Gyro-Matic Chrysler and most everything else made from 1900 to 2000. I've owned, at one time or other, every year Chevy made from WW2 to about 1965. I haven't figured out navigation systems, traction control and a bunch of other new fangled things and don't think I ever will. What I'm saying is that I'm at the point that I forgot more then a lot of people ever knew, and it seems that things get a little more difficult each day. I'll probably adjust the valves with it hot but off then see how it sounds. Mostly was trying to see if anyone else knew a better way. Oh, and I did search the topic before I posted the question.