ATI’s Serpentine Pulley Kit for blower cars gives you the option of replacing the V-belt pulley on your supercharged car with an attractive 6 rib serpentine set. The three 6-groove serpentine pulleys create much better grip, eliminating alternator or water pump slippage. Each kit is comprised of a crank pulley, water pump pulley and alternator pulley; all made of 6061 aluminum and black hard-coated for durability. Works perfectly with ATI blower front dampers!