Install them one at a time, not all at once before checking the cam fit Install the rear one first(the smallest one)and then slide the cam in to see if it spins good, if so do the next one and so on. If you run into a tight one, which you will eventually if you do enough Mopar V8 blocks, then you can use a bearing knife carefully to remove the shining high spots, a little at a time until that bearing will allow the cam to rotate freely Good luck, let us know how your first one goes Use the tapered alignment guide to get the tool centered on all of them that you can use it on , the front can be a challenge