Difference in heads was stellite faced exhaust seat in the one used on LP tractors and no valve rotorcaps. This following is for head numbers after the originals that would be a bare casting number of 8574DB or 8060DC used at factory on real late M through SMTA. 8574DCX was a head without valves for gasoline and LP. 356994R92 was a 8574DCX head with valves and rotocaps for gasoline. 8574DCY was a 8574DC head with valves and no rotocaps for LP. IH was still using that size combustion chamber head on some power units and industrial machines after farmall tractors stopped using them in production. 8574DC and 8060DD was just a upgrade from the previous castings used on SM tractors and became the replacement parts head in 1955. Did you notice the number on the firecrater pistons. Going by memory but think the standard elevation one is 374457r1. If thats what you have. To be safe I would guess around 10 PSI on both sides of 130 PSI cranking after break in. H.E. 374471R1 used as S.E. in LP. What most call a LP head from the middle fifties was cast # 364586.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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