sgt bull: I've read most of this thread. I guess you've already decided it's not a C-153. The C-153 never came along until the late 50s and is a much lighter block than those used in H, SH, 300 and 350. Like Cowman said it looks more like a bored out SC engine. It does not have sleeves, like most IH engines of that era. The first tractor IH put the C-153 in was the 504 gas version. If for any reason you decide it is a C-153, I would unload it before I even looked inside. They weren't much of an engine compared to the pre 1958 4 cylinder IH gas engines. I bought a 504 once, part of a farmers complete line of equipment. At 1,500 hours it was at the IH dealers having an engine rebuild. When it came home the vendor wanted to operate it for a day. I hooked him up to the 9' haybine, he mowed for 10 hours. At the end of the day he advised me to unload the tractor and keep my old Farmall 300 with 15,000 hours. He knew I was planning to trade 300 on a new 1066. Just to satisfy my own mind, I took 300 and 504 both to field one day along with a No.60 3x16 plow. Remember IH and Nebraska tests pegged the old 300 in the area of 35 hp and the 504 at 46 hp. I can tell you that Hugh MacKay's plow test will not confirm what IH and Nebraska said. My old 300 smoked that 504 on that day. That was in the summer of 1975. I have to say, at 33 years of age it was my first disappointment with an IH tractor. Within two weeks it went down the road and the old 300 stayed.
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