Ford Small Block Billet Aluminum Underdrive Pulley Set - Black

• Reduces accessory drag to help free up usable engine horsepower

• Billet aluminum construction cuts rotating mass vs. stock steel pulleys

• Fits Ford SBF Windsor 302 (5.0L) & 351W serpentine applications

• 3-piece set includes crank, water pump & alternator pulleys plus hardware

This billet aluminum underdrive pulley set is built for Ford Small Block Windsor 302 (5.0L) and 351 Windsor (5.8L) engines running a factory-style 6-rib serpentine accessory drive. Reducing accessory drive speed frees up usable engine horsepower by lowering the energy needed to spin the water pump and alternator, while the lightweight billet aluminum construction cuts rotating mass compared to stock steel pulleys.

The set includes a 6-groove serpentine crankshaft pulley, a non-ribbed water pump pulley, a 6-groove serpentine alternator pulley, and the crankshaft pulley bolts needed for installation. Power steering, A/C, and idler pulleys are not included, which keeps this kit compatible with a range of existing accessory configurations rather than requiring a full accessory drive swap.

This kit is designed for 1979–1996 serpentine-equipped 302 and 351W applications, with one exception: it does not fit 1994–1995 Ford Mustang applications. Confirm your accessory configuration, belt alignment, and clearance before installation, since serpentine routing varies across Windsor-powered platforms.

Applications
Fits Ford Small Block Windsor 302 (5.0L) and 351W (5.8L) engines using a factory-style 6-rib serpentine belt system, 1979–1996, excluding 1994–1995 Ford Mustang applications. Common uses include Fox Body–era Mustang performance builds (1979–1993), F-150 and Bronco 5.0L/5.8L projects, LTD and Crown Victoria 5.0L upgrades, street rods, and restomod Windsor-powered builds.

Installation
Set includes crankshaft, water pump, and alternator pulleys along with crankshaft pulley bolts. Power steering, A/C, and idler pulleys are not included — verify your existing accessory configuration, belt alignment, and clearance before installing, since compatibility depends on how your current accessory drive is set up.

Does this underdrive pulley set fit a V-belt Ford Windsor engine?
No. This set is designed for compatible 302 (5.0L) and 351W applications using a factory-style 6-rib serpentine accessory drive. It is not designed for V-belt systems.

Does this fit a 1994 or 1995 Ford Mustang?
No. This pulley set specifically excludes 1994–1995 Ford Mustang applications.

What pulleys are included in this set, and what's left out?
The set includes crankshaft, water pump, and alternator pulleys, along with crankshaft pulley bolts. Power steering, A/C, and idler pulleys are not included.

What does an underdrive pulley set actually do?
An underdrive pulley set changes the accessory drive ratio to reduce the speed of accessories such as the water pump and alternator. This can reduce accessory drag on the engine, but accessory performance and charging output should be considered, particularly at low engine speeds.

Is this pulley set aluminum or steel?
The pulleys are constructed from billet aluminum, providing reduced weight compared with typical factory steel pulleys.

Will this work on my Fox Body Mustang build?
Yes, for compatible 1979–1993 Fox Body Mustang 5.0L applications using the correct factory-style 6-rib serpentine accessory drive. Verify your existing accessory drive configuration before ordering.

Does this pulley set affect emissions compliance?
This is a mechanical accessory drive component and does not directly modify the engine's emissions-control system.