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6 V8 1977 - 1978 GMC K15 305/5 V8 1979 - 1985 GMC K1500 350/5
Freightliner MT45 (1998
4L V8 1997 - 2000 GMC K3500 454/7
2002-2006 Chevrolet Avalanche 1500 325 CID
Fits 1979-1993 Mustang 5.0 3 Pc Performance Under Drive Pulley (Billet)-1553 Intake Manifolds 6 V8 1977 - 1978Install 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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