I used it in the past with my 440-6 when it had a aggressive solid cam, 2” hooker super comp headers, 915 heads, switching between 160 and 180 t stat and mechanical carbs, 3500 TC. to be honest Bill, I don’t think it made a difference. When moving temp would be around 185-190, when at a light 200 and a little higher(on a mechanical gauge). I think that was due to the sum of the parts. Now after rebuilding/restoring, 9.5 compression, stock converter, stock carbs, exhaust manifolds, 180 stat, 906 heads, on the rally cluster temp gauge on a hot day it hangs right at the little line at the edge of the C range, barely breaks a sweat...I sometimes wonder if it’s running too cool. I don’t think the WW did anything personally.