Quote:
Originally Posted by toolboxchev
I would start with seeing how they are plumbed in the stock vehicles, both the old and your newer vortec.
Problem solving could start with keeping it simple.
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Did just that today. Found a 70 c20 and an 80 1500 that were plumbed from manifold and radiator to heater core with the water pump port plugged. Not Vortec though.