The installed valve stem height is the same no matter which head is used on the M. If the valves are too long your replacement head is either for distillate or kerosene. Gasoline head valves are the longest.
The machine shop should have know the installed valve spring height was wrong. They would have needed a lot of spring shims to get the height correct, enough to know that there was a problem with the valve length. even if they were such a thing as longer push rods you would need to raise the rocker shaft enough to compensate for the increase valve height and without a lot of spring shims the spring pressure will be way too weak. Then you would need to lengthen the oil supply tube to feed the rocker shaft. When you got that done the rockers would most likely hit the vapor vent tube and may even make contact with the valve cover.
The only real solution is to redo the job and make sure the valves are correct for the head being used.
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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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