Thanks guys. Never heard of using vinegar so I will give it a try. Used Prestone cleaner and it worked to some degree, but needs more. I usually don't have overheat issues with my cars but this one sat for a long time(Body shop horror story!!) Has a new Desert cooled Rad, new HD clutch on the fan and its got a new t-stat and water pump with cast impeller. I made sure the divider plate was touching the impeller without gasket. initial timing is set at 14 with total 36 at 2500. Cliff's Q-jet. I thought all my bases where covered, but apparently not.
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