Well, so far I have not adjusted the valves. My friend has multiple things come up and I may end up doing myself. Years ago I helped a guy do a Chrysler slant 6 but, I can't remember how to do this other than the gap between the stem and the rocker should be at it's widest and each valve should be closed completely. Then you adjust with feeler guage, etc. Got any clues? I've been digging around on the internet and not coming up with a good, clear tutorial. Another problem I see is that starting it has changed. It seems to start best if I let the starter stay engaged slightly longer than normal. Otherwise it will start and die while I fiddle with choke. I also need to open throttle more than before. The choke seems to be at the correct position with the lever pulled or relaxed. Anybody have any ideas? In the meantime I've looked at a New Holland machine and like the design although the newer stuff has more electrical gadgets than what I'm used to. The engine seems easier to get to. I'd be happy to listen to any and all comments on any of this. Thanks Greg