12. This was where we ran into our first problem. The new water pump pulley that was included in our truck kit was actually for an F-body car and the water pumps are different. What that meant was our 4-inch-wide pulley wouldn’t press onto the shaft a safe length without hitting the base supports of the water pump. Rather than press our luck, after the mock-up photos were taken, we took the pulley to a machine shop and had -inch shaved off the bottom and that made it fit perfectly.