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 - Two-Brush Generators - by Chris Pratt. Whether for product liability or because the aftermarket parts and labor business is lucrative, this concept is disturbingly prevalent. Fortunately when you step into your shop and make that jump 50 years back in time to work with your old tractor, this concept goes out the window. Even so, when it comes to the charging system, people quickly revert to this idea and start replacing the major components one at a time until it works. The reason you don't find any decals in your replacement set wit
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