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Why do you suspect a water flow problem? I guess it's overheating,, but how? At idle,, or after a steady load?
If you can't maintain a good temp at idle,, I suspect air pockets in your coolant lines. Have you tried "burping" all the air out of the coolant lines?
Also do you have a good working coolant recovery bottle? If you can drive your car and it eventually creeps up in temp,, you can do is try "redline water wetter" or any of the knock offs,, this alone is usally good for about 10~20 degrees F.
Lastly,, you should make sure the air ducting in the front goes thru the radiator and not around it,, this also makes a big difference.
Another method that will improve coolant flow is to DECREASE the coolant line diameter if that's truly your problem
Good luck with the project.
-Rob
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