In my opinion and with respect, The rockers and pushrods, and stands are all the same length between heads. The combustion chambers differ between Distillate, Gasoline, and (on later vintage heads that will fit an M) LP heads. This difference changes the length of the valves to get to the seat depth in relation to the engine deck. Thus any head rebuild (done correctly) would have the correct valves for the head installed. This is true even if the head was delivered with the wrong valves. The repair shop uses specifications for spring height, valve length, and other critical measurements to assure their repair won"t come back. If the work was done on a hollow core door behind the oak, on 9 cement blocks, and the valves were ordered based on the words M Farmall, the rebuilder is still at fault. If the tractor owner supplied the valves, and said "put"em in", or rebuilt the head in their own shop, then s/he is to blame. Jim
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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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