The 6.2 Boss T&D Machine Products Adjustable Billet Steel Rocker uses a proprietary Billet that is spec’d from the mill. The fulcrum uses a bushing for long life, and it also has a smaller O/D than a bearing which allows for added Cam Lobe clearance. The adjustable swivel foot is the same style used on the T&D Ford 427 SOHC “Cammer” Rockers. Utilizing a Needle Bearing Roller, these rockers will handle all the abuse you can throw at them.