Valve in Head and I engines and Over Head Valve engines are the same thing. F head has exhaust in the block and intake in the head. Flat head engines (or side Valve have all valves in the block, T head has intake on one side and exhaust on the other but in the block. Single OHC has valves in the head and the cam. DOHC has 2 cams in the head and all the valves as well. There are other exotic and mundane designs like valves operating sideways, and sleeve valve engines. Jim
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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