Re: running hot
My 28 sent coolant out the overflow, until I flushed the block and radiator. My 29 sent coolant out the overflow because the cheap 2 row radiator couldn't handle the flow.
I would start by installing a thermostat. Trimming down the water pump fins is OK also. Be sure to use antifreeze, as it also raises the boiling point. Be sure timing is correct, and I only set it by the factory method. Pull the handle half way down as soon as the engine starts, and about 2/3 down while driving at 45 MPH with a stock engine. A bit less advance for a high compression head.
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