There is a bar that goes across the back of the cams to hold the cams in place, a pin that goes in the block to lock the crankshaft and a tool to align the crankshaft position sensor to the front cover. Crankshaft pulley bolt is one time use and needs to be replaced, there are diamond washers on each side of the crankshaft gear that need to be replaced any time the pulley bolt is removed. I would also recommend the tool to install the a/c compressor belt, some stretch belts come with the tool