Chevrolet GM Truck 4.3 5.0 5.7 Billet Aluminum Underdrive Pulley Kit 88-95 PART #1603 FEATURES: Bolt on 8-15 Horsepower in Minutes Lightweight CNC Billet Aluminum Construction Retains Proper Cooling and Charging Requires 6-Rib 91.5" Length Belt (Factory Length Varies) VEHICLE FITMENT: 1988-1995 Chevy Truck 4.3L V6, 5.0L or 5.7L V8 Requires the use of a NEW Serpentine Belt - 6 Rib - 91.5" Pulley Measurements Approx. Crank - 5.90" Water Pump - 5.98" Alternator - 2.96" Easy Bolt On Power Upgrade BBK 1988-1995 Chevy Truck 4.3L V6, 5.0L or 5.7L V8 performance underdrive pulley kits are one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. BBK pulley kits are designed as direct bolt on replacements for the current factory pulleys and retain full cooling and charging characteristics. Easy Installation BBK performance underdrive pulleys easily bolt in place of the factory pulleys using the factory hardware. Each kit comes with complete installation instructions and retains the use of the stock length belts. Lightweight Aluminum Construction Not only is aluminum great for durability but it also reduces rotating weight, further reducing strain on your accessories.