Scroll notes
Type firstDescription
640 in Bores
Fender to Nose
IP-67 case
This item does not fit Dually models
Shock mounts sold separately
BBK Under Drive 6-Rib Serpentine Pulley Kit - Polished Aluminum - Small Block Ford - Ford Mustang 1979-93 10000104 640 in BoresInstall 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
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