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The water pump spins reverse rotation with the serpentine setup. If you use a fan off a vehicle with a clockwise spinning engine, it will push the air back toward the radiator. The CCW fan blades are pitched the other way. If you go with the serpentine setup you will need the a CCW fan clutch and water pump too.
A serpentine would be nicer. Earlier V belt equipped 6.2's w/o the rubber padded lower pulley are notorious for belts loosening, squeaking and needing tightening. Not a bad problem, I learned to live with it, but annoying for people that don't like tightening their belts every few months. Knock on wood I haven't had to adjust mine for 8 months.
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81 HJ60 Costa Rica Cruiser
82 FJ60 Trail Rig. Convertible, 2F, H55, Toybox, SUA, 37" MTR's
83 JJ60. Daily driver, OME, 33's, 6.2 diesel, NV4500, WVO
http://mysite.verizon.net/sbutman1/LC.html
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