Quote:
Originally Posted by 'ol Pinion head
the cast impeller on the Gates 43122 has full length very aggressive vanes, unlike what was used on a late '63 & '64 8 bolt waterpump. One needs to understand, the '64 radiator has both the rad inlet & outlet on the same side (pass side) of each tank. One can actually circulate the coolant through the radiator too quickly, that's why early 8 bolt pumps used a shorter less agresive vane impeller, than the impellers used in the 8 bolt pumps used from '65-68.
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Actually the later vanes are not all that aggressive. These two impellers are of very different design. The early version has vanes facing one direction and the later facing another. The early design scooped the water and needed the smaller vanes and a gap to avoid Cavitation. The later design solved a lot of Cavitation issues by moving the water with what some may consider the back side of the vanes. The second design moves more water.