360 Tune Up

This is from a digital '73 Dodge FSM
It shows the pully ratios but not the diameters.
The smaller impeller A/C water pumps get a different drive ratio.
View attachment 1715340461

There are a couple of threads here on the topic of OEM pulleys.
I'm not much help on that.


Almost all of them are shown as over driven and the first things guys want to do is slow the pump down.

That's a killer for sure. It's all about flow. Coolant flow and air flow.