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I always thought distilled water was best also, but after some research I ended up using drinking water (purified by reverse osmosis) and No-Rosion which is probably similar to what you are using to protect the aluminum radiator. He said it would also bring the temp down 10 degrees, but it didn't....
You've done that and adding a shroud with no temperature change, correct? I think there's some cause more inherent. Engine tune, radiator size, flow restriction. Have you ran this very engine block before without cooling issues?
These are the results from a comprehensive cooling additive test done by Turbo Magazine: TEST They used heat gun in various places (cyl temp, etc) and factored any difference in outside temps. Justice Brothers Super Radiator Cool (RC/22P) brought the coolest temperatures:
Last edited by autoxcuda; 07/25/12 02:40 PM.
