Weird ? about small block pulleys

RustyRatRod said
I've torn down a LOT of Mopar engines and I have yet to see one where the water pump was driven 1:1 or under driven. All I've ever seen the water pump was overdriven, if not only slightly. Of course, I've not seen it all by a long shot, either. But for any type of performance build, I would want my pump overdriven.

That’s interesting, because the standard factory ratio was .95:1 for the water pump pulley. AC cars were overdriven at 1.3:1 or 1.4:1. But they also got a water pump with only 6 vanes, versus the non-AC cars that got an 8 vane water pump and the .95:1 ratio.

The factory pulley ratio’s by engine…