With my experience with Pumps .. the pressed steel blender style impeller is use less ... Edelbrock and Flow cooler have a Cast Vained impeller with backing plate which appears to be all one piece .. this is the normal design of a pump impeller .. which I believe would give you optimum cooling ... I think we should ask George to contribute as I think he could also help confirm this ... not that the others dont work because they are on probably 99%of all factory cars.
Ron
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