I have a 66' 289 with medium modified engine and bolted the fan straight to thewater pump with a spacer behind the fan of course and it runs cool all the time even with more water than coolant in system. It has roughly 75%W - 25%C and I dont have any problems around the city.
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66 Mustang Black W/ Black
289 Hi-Po 65'heads, MSD
Lunati High lift Cam
750CFM Carb
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