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I had an aluminum pulley on the crankshaft of my Stealth :(
It lasted about 3,000 miles. The belt was wearing the pulley away. The belt was embedded with alum dust and would slip at WOT. (pulley = $195.00 / new belt = $83.00)
If the manufacturer would have used 7xxx series of heat treatable alum the pulley would be on the car today. (all in the formula)
I do not think the "wear factor" on these SC pulleys will have the same result as above.
One simple question will tell the tale - can you turn the SC by hand? If yes the aluminum pulleys will be just fine.
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Never drive or ride faster than your guardian angel can fly.
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