Make sure that they are tight. Buddy of mine bought a Mach with UDP, turned out that the crank pulley was loose. I dont know exactly how it happened, but it caused him to spin a bearing. This, I asume, is an extreamly rare case but it wouldn't hurt just to check them if you buy the vehicle. Otherwise, I dont see any harm in buying a car with pullies.
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2003 Azure Blue Mach 1- M112 Eaton Supercharger (Stock Pullies/Unported/Stock Bottem End/Stock Heat Exchanger/Cobra Tank and Pumps), 4.10's, SCT Custom Tunned by Excessive Motorsports, SLP 2 w/ Mac Catted H, H&R Sport Springs (Uninstalled), BFG KDW2 295's.
Dyno Numbers- 442.31hp and 386.03tq
Track Numbers- 13.014  @ 115.45 w/ 2.200 60ft (Track Wet)
Progress Pictures: http://s28.photobucket.com/albums/c2.../Eaton%20Swap/
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