Flowcooler made a Magnum style reverse rotation coolant pump that flowed about 30% more at the same rpm.

Nascar cooling guru Howard Stewart wrote many years ago on his board that GNB brand replacement pumps were generally better than others.

In 1992 Chryslers official press release on the then new Magnum 5.2 V8 bragged that the new coolant pump was 100 gallon per minute with an efficient design.

To me, as a mining engineer that has looked at hundreds of pump insides, the stamped steel impellor of the Magnum factory pump looks cheap and crude.

Some of the Magnum stamped steel impellors have failed from cavitation damage when the antifreeze mix was not maintained by owners.

The impellor of the Magnum V10 coolant pump looks like a better design but will not fit the V8s.