Malky, that is an interesting observation. The only logical explanation I have is that with the taller pump vanes, it would seem like the sucking action of the pump drawing coolant out of the block will be improved. This appears to be the key to keeping our Pontiacs cool, rather then sheer volume of coolant flowed. We already know how critical a fraction of an inch is in pump efficiency, and how much a small adjustment to the pumps efficacy can improve cooling. With the taller, more efficient vanes, it appears that longer vanes are no longer needed. Perhaps a longer and taller vane will come into contact with part of the plate, and manufactures are forced to choose between longer, or taller, but not both. In either event, with the success everyone is reporting, apparently, taller vanes beat longer vanes every time.
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