The Ford Racing roller camshaft bearing set for 351 Ford applications uses needle rollers to cut cam friction and reduce windage losses. These ultra-low-friction bearings permit crankcase splash lubrication so stock cam oiling holes can be blocked, helping lower oil aeration. The set is supplied with position-specific sizing for 351 engines and requires block machining and an SAE 8620 steel camshaft.
Ford Racing Camshaft Bearings - Roller (Sold in Engine Sets)