Brad: There is a thread down this page where KB826 is advising a guy the C-153 engine is the largest in the basic family of C-113, C123, C-135 and the C-153. I'm not sure KB is looking at this from all angles. Some of those engines were used in two entirely different configurations. I make note of the C-135 for example, used in the 404 with transmission driven pto and also used in the larger chassis 330 and 340. Block was the same for both applications but the crank was different, having different pilot barings. We do know the D-188 diesel was used in the 504. That engine is basically the 4 cylinder version of the 282 used in the 560, 656 and 706. The 460D used the same block as 560. I'm not suggesting you try and install a 6 cylinder engine in the 504. What I am saying is we know a D-188 will bolt right in with very little modification other than breather, wiring, etc. Problem is not many D-188 engines were built, so you will likely find that one scarce. I would take a look at C-169 or C-175 engines from the 300 and 350 respectively. If those will work you would have a sleeved engine with a good reputation. I'm not saying I'm right, rather I'm hoping to get folks thinking of what is possible for you. I'm betting the C-169 or C-175 will bolt up as 504 is same torque tube as 460, and the only difference between those and 300 or 350, is placment of the hydraulic pump.
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