Under Drive Pulleys

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 a New Belt For Installation

Additional Information

Power-Plus Series® Underdrive Pulley System; CNC Machined Billet Aluminum; 2 Piece Kit; Incl. Crank Pulley/Alternator Pulley/Required Hardware;

Part Type

Engine Under Drive Pulley Kit

• Direct Bolt on - Lightweight CNC Billet Pulleys - Reduces Parasitic drag to increase horsepower
• Made In The USA

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Crankshaft Pulley, Serpentine, 6-Groove, Aluminum, Polished, Ford, 3.8L, Each

BBK Performance crankshaft pulleys are CNC-machined to run true. These pulleys are designed to fit your application, while retaining your stock belt. They are made from billet aluminum and are hand-polished for a great finish.