Does the engine have a vacuum advance????? Is it working right????
Try backing the timing a degree or 2. I had a small block Chevy we had to do that to when we pulled heavy trailers.
There is an additive that claims to drop coolent temp up to 20 degrees. I never tried that stuff......not sure if it will help.
I would try running the tractor without the muffler and air cleaner.....only way to eliminate that possibility.
Let us know what you find.
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