On my '65 I use a product called:"water wetter" found at a local auto parts store.Yes i did see a differance in cooling ( about 10-15 deg. )I also use a 60 h20/40 mix in the stock radiator with no problem. I understand that these cars tend to run better at about 180-195 so dont put in a thermostat any lower than these.Also , I use the stock "4" blade fan.(289 -2bbl)
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Restored 1965 Coupe
April Mare of the Month 