I recently torn apart a C-263 out of a 2000 hour 615 combine. The top side of the engine looked like it was COOKED. Cyls looked good, pistons were carboned up bad, intake ports were clean, but the exhaust was carboned up just as bad as the piston heads. My thoughts were the exhaust ports were too small for the design of the engine. It can take a big breath in, but it cant exhale it out fast enough. It creates backpressure, once the engine starts lugging, the head gets hotter than usual by HOLDING IN the heat. Water temps would be normal, but the oil and the cyl temps would be in left field, literaly cooking the pistons and the valves, burning the oil right out of the cyl, creating carbon deposits that would not normally be there under normal conditions.
If that cyl temp is heating up from restriction, and not by cyl pressures, the reqirement for higher octane fuel is needed to keep the fuel from preigniting from the excessive heat build up. I belive if the pressure is relived in the exhaust ports, and matched up the manifold, you may not see this condition, and lower the octane requirements from lowering the cyl temps. Ya got 4 cyls breathin thru 2 ports,,, and they are restricted in stock form thatthe problem with valves and headgaskets have been problematic since the 460. I dont know of anybody having the problem in a truck engine that was basicly the same design,,,,,, ChadS
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