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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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