Originally Posted by Hemi_Joel
Originally Posted by Bob Stinson
Originally Posted by R/T1968R/T
Just fixed a 440 that had a marine impeller on the water pump. The impeller was made to spin backwards. Double check the direction its facing. Here's a reverse one!


FWIW I put a Milodon HV pump on my car recently and it's reversed compared to the one I took off. I then compared the one I took off to two other old ones I had and they are all oriented the same way.

The Milodon part number was clearly marked for CW rotation. I got it from Mancini. https://www.manciniracing.com/brbhigvolwat.html



Both of those pumps have the impeller blades at 90° to the centerline of the shaft. They would both perform equally whatever direction they spin. The orientation of the arms holding the impeller blades is irrelevant.


Thanks for the reply. I got a little paranoid because I had been reading a thread on the HAMB that talked about reversed water pumps on GM cars with serpentine systems, so I checked the description on Mancini's website before installing it.

The main difference I noted in the HV pump was longer blades and that plate welded behind them. Some of the old pumps had 6 blades, others had 8, I figure that is A/C vs non A/C.

69 road runner A12 ex-racer
71 Duster w/ a 400

Shiny paint causes stress.