Originally Posted by oldbluetruck
My flywheel is the smaller 216 one. I do have the larger 235 flywheel but believe the instructions said to stay with the smal 216 flywheel or the water pump will turn too fast.

By "flywheel" I assume you mean the crankshaft pulley? The 235 pulley is larger diameter, and might cause pump cavitation at highway speed, but it probably wouldn't cause any problems at idle. Try an infra-red thermometer aimed at various areas of the radiator to see if you've got spots that aren't doing enough heat transfer. If you're not using the 216-style water pump it's possible the position of the fan and/or the fan diameter might be part of the problem.

If it's not boiling over, it's not overheating.
Jerry


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