This is a very interesting thread. All I can say is I have had maybe 20 or so good running 64-7 mostly GTO's over the years and have never had a problem with running hot and I can't believe it's all luck. I have made sure that all the cars had not only cast impellers but the right one to the car. I have never measured any clearance cause I didn't have to.
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Practicing social distancing for 65+ years
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