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Dr.Evil: the C-153 is actually more closely related to the C-123 and C-135 than it is the C-152, C-164, C-169 or C-175, however it just doesn't have sleeves. The 504 I had, came with a farm I bought in 1972. He had traded a 300 on new 504 gas in 1967. When I bought the farm the 504 was at the IH dealers having the engine rebuilt at 1,500 hours. He had never been satisfied with the performance of the 504, had been on the dealer about it since new, telling the dealer even though the 504 was rated 10 hp more than his 300. He told me it wouldn't hold a candle to the 300 on hard lugging. He badgered the dealer so bad, finally they agreed to open it up to see what was wrong. They bored it and installed larger pistons. During the time 504 was away I bought his farm, complete with equipment. When they delivered the 504 the vendor wanted to run it for a day on work. We hitched him up to my 9' haybine, and after 3 days, he suggested I not keep the 504 very long. He knew that I, having doubled my land base was planning to trade my own 300, about 15,000 hours at the time, off on a new larger tractor. He had driven my 300 and suggested I keep it and trade the 504. One day I took both the 504 and my 300 to the field along with a 3x16 No.60 plow. He was right, even after the engine rebuild the 504 wouldn't hold a candle to my old 300, then about 3,000 hours into it's 4th set of pistons and sleeves. The 504 went down the road. The IH dealer told me some years later, he sold that 504 about 4 times and no one kept it longer than 2 years until they were back wanting to trade for some real horse power. He said it was the only 504 gasser he ever sold, and that the diesels he had sold went out and he never saw them again. I quite agree with you the M engine is not the answer. He'd be better off finding an M to put around his M engine. I always tell folks with 504 and a C-153 engine, go for a C-169 or C-175.
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