I used the 14" bacause it fit right on. With the new valve job, radiator, 180* thermostat, cap, hoses, added cooler, so far it has not gotten over 190*. Temp gage sit below the 1/2 way. I've pushed it hard on several 95* days with the a/c on, gage rose a tiny bit, but up tp 1/2. The fans...