16v is what I have run for a long time -- everything is happy , water pump spins faster, fan faster , for power out of coil, cranks over faster -- ect ect. I also run a 16 volt 100 amp alt. as my fuel injection takes a lot of juice -- esp the fuel pump. only issue i ever had was with a Radiator fan -- guess the 18 plus from the alt was to much.
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