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With all due respect, I doubt seriously what's in his radiator is the root cause.
Maybe something will run 10 degrees cooler than something else but he should see a larger drop.

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on the root cause.

Either a combination of small stuff, radiator blockage, or a tuning issue.

Wonder if cam duration 254 @.050 with 3.75 stroke, 9.5 converter, rear gear factor in here???