Known issue...
Their original casting had smaller water ports...

In fact, rite now they are selling these parts @ a discount on their website..

"We have a limited supply of our 200-1079 Passenger side aluminum water pump housings which have been cast with a slightly smaller than normal lower water port.
We've used these on many engines without any problems, however because the ports are slightly smaller than normal, we are selling these as a "blem" item.
If desired, with a die grinder and carbide burrs, the passages could be opened up, similar to cylinder head porting.
A steal at this price, we've marked them down to over 50% OFF the normal price. Get them while they last. Once they are sold out, they are gone forever. $48.95 each..."

A friend ran 1 of these on his stroker 440, it ran hot...
Swapped it out for the Mopar performance part, tempeature dropped 10 degrees in So Cal traffic..


Just my $0.02...