If your goin to run it alot and hard i think you wana go with stellite for the exhaust, regular is fine for the intake, at least thats what an older guy that rebuilt kohlers for a living told me i think.
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Original,100,123,129,1200,1250,168 in progress (3) 42inch plows, QA-42A,#1 tiller, 10inch brinly plow, Case Ingersoll 224, 1948 Farmall H, 1950 McCormick W-6, 1952 McCormick W-4.
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