Idler Pulley PV08260 from Ilmor is for the supercharged engine and the 520 MPI-S. The idler pulley is exactly that. The bearings over time in your idler pulley can fail due to excessive use, improper alignment, and water intrusion.
WARNING: These products can expose you to engine exhaust, during operation, containing chemicals including carbon monoxide, benzene, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65warnings.ca.gov/marine
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