These performance cam bearings provide oil pressure 360 degrees around the backside of the bearing so that you can install the oil outlet hole in the most critical area. This is a superior method to lubricate the five camshaft journals. Tests have proven that frictional drag was reduced significantly by pressurizing oil 360 degrees around the back of the cam bearing, and then releasing oil at the three O clock position over the conventional 6 O clock position so commonly found in most non-performance applications. We are the innovators of this design and have been using these performance bearings in every engine we build. It works!