Are there any engine cooling issue's with the troyer under drive pulleys ffor the '04-up 5.4L f-150's?

 

I have heard that it would be unnoticed, but in theory it doesn't cool as good I guess. I've looked into getting pullies, but even my brother with a 500+ hp 306 ci mustang said don't bother. I guess they really only work well in road race applications with alot of high rpm driving. Oh well, ya love em or hate em, but cooling inefficiencies, I wouldn't worry, the f150's cool pretty good on their own so you'll be OK.

 

The Troyer underdrive set does not underdrive the water pump. The crank pulley is smaller than stock, and the w/p pulley is larger than stock to maintain cooling.