BBK 1603 Underdrive Pulley Kit for GM Truck 4.3/5.0/5.7L - 3 Piece CNC Machined Aluminum by BBK Performance at Boogaloo Festival. MPN: 1603. Hurry! Limited time offer. Offer valid only while supplies last. BBK Aluminum Under drive Pulley Kit for GM Truck 4.3/5.0/5.7L - 3 Piece is made from aircraft quality aluminum alloy. These BBK under drive front accessory pulley kits are one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. These BBK pulley kits are designed as direct bolt on replacements for the current factory pulleys and retain full cooling and charging characteristics.BBK is your Number One Aftermarket Performance Brand in the USA - American Designed and
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