BBK Under Drive Pulley Kit 6 Rib Serpentine Aluminum Polished - Small Block Ford AS04421 Constructed of 6061-T6 aircraft grade

Constructed of 6061-T6 aircraft grade aluminum or stainless steel

00 Female to 4 AN Male

Measures 1

(1) AN-12 to (2) AN-10 Male Flare Y-Block

BBK Under Drive Pulley Kit 6 Rib Serpentine Aluminum Polished - Small Block Ford AS04421 Constructed of 6061-T6 aircraft gradeInstall 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