These pulley sets are designed for long water pumps with a 7" flange height and a 5/8" shaft, common on most stock long water pump GM applications. These pulleys can be used individually and line up with most GM factory pulleys, brackets, and pumps, or can be used as sets with our accessories and mounting brackets.

Precision machined billet aluminum pulleys
Deep V groove design for better belt retention
Hardcoated black for increased pulley life, strength, and appearance
Lightweight aluminum design for less rotating weight
Desgined to free up horsepower and increase high RPM performance
  with lower crank to accessory ratios:
       Water pump 78% of crank speed
       Power steering 91% of crank speed
       Alternator 169% of crank speed.