Sometimes Older is Better

And just to update, the temps are still down 5-10 degrees, and the engine temp stays steady idling at a light. Before it might creep up a bit. This is in 80 F temps.

BTW, this fan is 1" from the rad. The main plane of the stock fan was at 1.5" from the radiator. So that may be a factor.

Bottom line seems to be that you don't know 'til you try.