Review on 🔧 BBK 1603 Underdrive Pulley Kit for GM Truck - 3 Piece CNC Machined Aluminum, Suitable for 4.3/5.0/5.7L Engines by Marcel Robinson

This kit was installed without the alternator pulley and with the Continental multi-ribbed belt. Noticed better throttle response and smoother highway driving. I can't speak too well about gas mileage because I always "enjoy" said throttle response, but it didn't work despite driving more aggressively, so theoretically it's actually improved. Installed (along with SEVERAL other mods) on my 90 C1500 Chevy 350 Gen I TBI with AC and automatic transmission. Because it's cheap and easy, it's smart, but for people who have a "project car" as a daily driver. It is very important to use a quality belt that is the right size. I use a 4060915 Continental ribbed belt.