M-6261-R351* Fits 302/351 Ford Racing Blocks Common outer and inner diameter replacement cam bearings for use in M-6010-R302/S302/R351/R352/S351/V351/W351/R451/R452/R453/B302BB/BOSS302/BOSS35192/BOSS35195/BOSS351BB. Use with custom ground common O.D. camshaft M-6261-J351* Fits 302/351 Ford Racing Blocks Common outer diameter service replacement cam bearings for use in M-6010-R302/S302/R351/R352/S351/V351/W351/R451/R452/R453/B302BB/BOSS302/BOSS35192/BOSS35195/BOSS351BB. cast iron blocks Use with standard camshaft