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You were the one who had something going with the Justice Brothers, weren't you?

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Yes, for the last 10 years I've worked for them www.justicebrothers.com . And that and my Engineering degree is where much of the technical training on this subject comes from. Please don't hold it against me if the product I sell works. That magazine did the test.

The basic principles here apply to any cooling system no matter what the performance of the product you choose to put in it.

You can see boiling point is most all dictated by the radiator cap.

IMHO, typically the next important thing is air flow (fan shroud) IF already the radiator is big enough and system has good flow.