Main bearing installation is relatively easy and, if the tangs fitproperly, it's hard to mis-align the oil holes. It is, however, slightlymore difficult with the cam bearings. These are one-piece cam bearings,and they are held in place by a slight crush fit between the mainbearing and the housing bore. If you have the right tools, installing aset of cam bearings isn't difficult. You just have to be aware that oncethey are in place, the oiling hole cut in the bearing lines up with theoil gallery from the main bearing.