Interesting observation. Since you say your configuration is similar to Old Goat, could it be possible that the original had the deeper vanes? I find it hard to believe that the factory would design it with that large of a gap. (.4",WAY too large). With this new data I would suggest that engines using the internal housing style of pump should have a pump style such as Old Goat installed currently.
Looking at the problem from the other direction, Old Goat stated he replaced the original pump (he bought the car new) some 10 years ago or such, and his heating problems started then, but not really noticed since the car was driven less.
This leads me to believe the first replacement pump had the wrong vanes.
Eric: I'd say If you could get a pump with the deeper vanes, you would be better yet.
Kate's GTO: the banks in Grand Cayman will be happy to accept your currency!
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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