Common for gas manifolds to be installed at a later time on distillate and kerosene engines. If all associated parts for fuels other than gasoline are missing it could be impossible to tell what fuel the tractor came with. Unless the serial number of tractor or engine has the letter A after the #, or maybe a B. On 264 engines the head # you have was supposed to be used for distillate fuel. It will have roughly 1 to 1.5 point lower compression ratio compared to the gas head. I would say your head could be original to a SM tractor serial # 21000 or higher for a farmall or 501500 and higher for a louisville one. Could be a replacement head also. Another thing that may or may not be a tip is the carburetor #. 356984 for gas and 357231 for other fuel types.
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Today's Featured Article - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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