Its a lot of little things. You also have to take the oil line off the block for the vacuum pump, install a t fitting and run an oil line for the p-7100. Its not all that difficult of things to do. Its just little things that most people dont think of til they are torn apart and dont have the time to wait to get the parts. Its nice knowing what all you need before you start. Like Tater said, I can do one in about 10-12 hours if I have someone helping me do it. It doesnt require two people, just nice to have a second set of hands.