Quote:
Originally Posted by denniskliesen
Mine barely touched the new 6:1 head I had installed. Had I known then what I know now I would have ground considerably more from the impeller. I know right where the rpm limit is otherwise it pushes coolant out the overflow. No it's not a radiator or overheat problem, it just plain pumps too much.
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I agree , my experience has been that the water pump just pumps too much . Snyders suggested years ago to modify the impeller . I grind the tips of the impeller blades . Snyders offers a modified impeller . This is pictured on page A-140 and they give the info that you need . You can get a good idea where to grind by looking at the pics if you decide to do it yourself .This mod will also slightly reduce some of the power that an over pumping water pump will draw .