Magnum cooling

Evan Dutch said
The crank pulley I’m using is the one supplied with the supercharger. It’s the same size or just slightly larger than the factory magnum crank pulley

Why I ask about the size & ratio of the pulleys is that this is really what solved the issue. That and the pump.

The big radiator and other upgrades were already there or added on at the time. Wouldn’t hurt to measure them up and work out the ratio you have.