Review on BBK 15550 Underdrive Performance Pulley Kit - High-Quality CNC Machined Aluminum 8-Rib for Ford F Series Truck, Expedition 4.6L, 5.4L - Complete 3-Piece Set by Ron Josey

I would have given it 5 stars but the alternator pulley was the same size as the one already on the truck. Why did I take the time to swap them out when they were the same size? I did it anyway as the lighter aluminum looked much better. Overall easy installation. Definitely need a puller, a stitch, and the instructions don't say you have to clean any part of the cylinder block to get the water pump pulley to fit. That's right, you need to remove the metal from the cylinder block. Could use this information in advance. Nice mod though. Definitely a noticeable increase in performance over my old 5.4. I got back what I lost when I wanted 35" tires. Worth the time and effort.