Need some help on pulley sizing

Note 1. Chrysler used over driven water pumps all the time.

The billet junk of the early 1990’s was the start of all these under drive pulleys and lived through it.

I’ve fixed more overheating bullshit in more critical builds than I care to think about.

If you throw a fan belt at 7k you have the wrong belt or pulley misalignment or something. I know because I turned a water pump 10% over on my race car and I shifted (most of the time) at 8500 and I never ever lost a belt.

A high volume pump, over driven with the biggest 2 core (1 inch core minimum) radiator you can fit and a quality high flow thermostat and you can cool any engine regardless of how much power it makes while driving right through downtown hell.

You know when you have it right because you can drop a 160 thermostat in and it will stay at 160 regardless of conditions.

I don’t get skimping on cooling. Make the thermostat do what it’s designed to and make it regulate the engine temperature rather than relying on all the other pieces to do what they can’t.