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I have a DeWitt rad in my 78 and it is one of the best improvements I made to by car .The temp in my car use to run between 210 & 220 and since I put the DeWitt rad in it nevers goes past 190 even on a hot day of driving.
I put a dewitt's rad in my car last year. So much better than the copper one. I was able to take out the electric fan because it runs soo much cooler. Thanks Tom! But I did not buy it when he had a discount. Just make sure your wife does not see the credit card bill!