Don't know if all tractors do, but some 300 with fire craters will hit the H head. If you look at your 300 head you will see the edge on the other side from spark plug is sloped off and the H is not. You can grind that sharp edge on the H head to work if the piston hits. Make all 4 the same and don't go to deep. IH sloped the edge in combustion chamber on the 8043 head when they put it on a SH and advanced the suffix to DD. May not notice any power change.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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