Here is another success story. My car is a 1970 bird, 462 with about 9.5:1 CR, and a 160 thermostat. My car alwyas ran cool, even with the original factory 2 core radiator, around 180. I just bought an aluminium radiator because my factory 2 core started to leak. Anyway, since I had to drain the coolant to install the radiator anyway, I removed the pump for inspection. I have the cast blade pump, blades are about 5/8", and 8 blades total. Not sure on the diameter of the blades, but they looked like they are probably around the 4 inchers....I have about 0.055 inches of clearance between the divider plate and the top of the blades. Therefore I did not touch the divider plates. What about compression ratio? I do know that this effects the heating and cooling capabilities...Just a thought.
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