I don't know what you're going to find that has sleeves... The C153 was only used in the 504's and one model of combine if I'm not mistaken, and the C153 is the only engine that will fit in a 504 gasser without major modifications.
As far as finding a replacement, you're just going to have to start finding tractor salvage yards and calling around. Unfortunately the 504 isn't terribly common compared to a C or an H, for example. You might have to drive a few hundred miles to pick one up when you find one.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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