5-8 HP is what we've seen on the dyno, but of course that's with a huge fan pushing 60 MPH air through the radiator so the load from the fan really wasn't accounted for.
Many people who have run the pulleys have said they notice modest gains in economy as well as a little more pep when driving. If nothing else, just think of how much less wear on the bearings and other components in the belt-driver accessories. That alone makes it worthwhile.
Hope this helps.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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