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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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