High Performance Billet Idler/Tensioner Pulley, for Electric Water Pumps LS Alternator Bracket you will need to purchase

you will need to purchase the 6-rib serpentine belt from your local parts store

The Type 1 system is specifically designed for LS engine builds that eliminate the factory power steering pump while maintaining proper belt routing and alternator performance

The adjustable idler improves belt wrap and belt stability

5 x 120mm bolts

High Performance Billet Idler/Tensioner Pulley, for Electric Water Pumps LS Alternator Bracket you will need to purchaseWorks the best on high horsepower applications with electric water pump. Precision machined billet aluminum pulley: 3 3 16" in Diameter. Guaranteed to be perfectly round and flat, unlike the polymer or stamped metal idlers Oversized high RPM bearings. Bore Bearing ID: 17mm (0. 669") The side flanges measure 0. 225" tall The diameter where the belt runs is 2. 75" Overall width of pulley = 28mm (1. 1"). Width of area where belt rides= 21. 5mm (0. 850").