If you have a ~450HP 350 and if your going to drive it in traffic during a hot day, or sit in that line of cars waiting to cruise past the local hangout on a summer night:
- With a manual, you'll have to come up with some kind of shroud to help keep airflow going through the radiator while sitting still.
- If you go electric, plan on upsizing the alternator because you may have to run your electric fan practically all the time. Make sure your alternator can keep up with this even at idle. Don't rely on the battery to make up the difference, because eventually, after a couple hours of cruising, it will die. Then you'll be stuck somewhere and look like a chump asking for a jump.
One of the best things I ever did was buy a Powermaster alternator that made enough power to keep the fan running at idle as long as I needed to. It cost an arm and a leg, and it was worth every penny. It changed the personality of the truck and made it fun to drive. Instead of constantly having to juggle between overheating and killing the battery, I could just leave the fan on and drive however, whenever, and wherever I wanted.
Beyond that things will get worse. It depends upon so many things, there's no way to say how much. Every engine is different.
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