BBK · New
BBK 88-95 GM Truck 4.3 5.0 5.7 Underdrive Pulley Kit - Lightweight CNC Billet Aluminum (3pc)
MPN 1603 · Store SKU bbk1603
Supplier stock checked 11/7/2026, 5:17:39 AM UTC. Adding a part does not reserve it.
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Product details
Install a set of BBK performance underdrive pulleys and see an average of 8-15 additional horsepower over the stock pulleys. Under drive pulleys increase engine output by reducing the draw of the engines accessories by slowing them down and reducing the HP they use. Additional and significant performance improvements can be seen by reducing the weight of the pulley versus the original pulley which is why we recommend the BBK CNC Machined billet aluminum pulley kits for maximum horsepower gains. ALL BBK pulley kits are designed as direct bolt on replacements for the current factory pulleys and retain full cooling and charging characteristics. BBK under drive pulley kits are vehicle specific and each kit comes with complete installation instructions. Requires the use of a NEW Serpentine Belt - 6 Rib - 91.5 in. Install a set of BBK performance underdrive pulleys and see an average of 8-15 additional horsepower over the stock pulleys. Under drive pulleys increase engine output by reducing the draw of the engines accessories by slowing them down and reducing the HP they use. Additional and significant performance improvements can be seen by reducing the weight of the pulley versus the original pulley which is why we recommend the BBK CNC Machined billet aluminum pulley kits for maximum horsepower gains. ALL BBK pulley kits are designed as direct bolt on replacements for the current factory pulleys and retain full cooling and charging characteristics. BBK under drive pulley kits are vehicle specific and each kit comes with complete installation instructions. Requires the use of a NEW Serpentine Belt - 6 Rib - 91.5" Power-Plus Series® Underdrive Pulley System; CNC Machined Billet Aluminum; 3 Piece Kit; Incl. Crank Pulley/Water Pump Pulley/Alternator Pulley/All Required Hardware; 1988-1995 GM TRUCK 4.3/5.0/5.7L 3PC PERFORMANCE UNDER DRIVE PULLEY KIT (BILLET ALUMINUM) 1988-1995 GM TRUCK 4.3/5.0/5.7L 3PC UNDER DRIVE PULLEY KIT (ALUMINUM) Power-Plus Series® Underdrive Pulley System
Manufacturer fitment & guides
Check 1603 against the manufacturer’s application information below.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
- California Proposition 65: Y
