I would not adjust the valve lash on that engine with it running, but, that is the way IH motor trucks always said to set them back in the days. The only time I ever had a feeler gauge chewed up was on an old chevy 235 power glide with hydraulic lifters. I had the bright idea (was young then) that if I just gave them valves a little bit of clearance beyond the maximum range of the hydraulic lifter that engine would quit burning valves. Well, that camshaft for the hyd lifter was pretty nasty about closing the valves apparently and just chewed up the gauge. Needless to say, that experiment did not work. Later on, found out the valve seats were all poorly fitted (loose) in head that had been worked over by a local machine shop. We found a different head and no more valve problems. Actually, setting valves with engine running gives you the reading off the true heel of the camshaft lobe. A lot of lobes have the ramp starting a considerable degree from the very heel of cam so when you have piston tdc comp stroke you are part way up the ramp. That is why I never use the simplified method of adjusting on several cylinders at only two positions of crankshaft. You can run into some measurable differences in clearance on different cylinders that way. Not much, but it can happen.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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