Is the fan center of the radiator ? There is a lot of discussions here on the short shaft water pump conversion.Did the truck run hot with the old temp gauge ? The water pumps on a 1955.2 to 1962 235 and 261 engines sit lower than pre 1955.1 series.

Just a thought.

Tim

1951 3100 Chevrolet
1951 Chevrolet Suburban Carryall
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