The impeller could be rusted badly in the water pump so that it is not effective at moving coolant. I think there is a coolant distribution tube inside the block that takes water to the rear of the engine. If so, it could be corroded or missing. Anyone know for sure if there is a tube in that engine?
Mac :{)
1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
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