You do not want to reverse the air flow. I did it once, the original fan broke, so I put an automotive aftermarket fan on. It made the thing totally miserable for the operator! Had to get a reverse rotation fan, put it back like it was supposed to be.
As said, they are known for the radiator fins clogging.
Also small block Chevys have a reputation for cracking heads. A combustion leak test might reveal the real problem.
Even if the original engine was smaller, unless this gets hard, heavy throttle use, good chance the engine is only working at a small fraction of its potential, so the heat load should be small.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
... [Read Article]
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