1969 Daily Driver

That chamfer on the main bearing is how the factory did the chain oiling. Aftermarker bearing do not have the chamfer. I always file it on the bearing shell myself. The aftermarket part number callout for the mains lists the same part number for number 1,2, and 4 main. The factory part book, lists the same number for number 2 and 4, but a different number for 1.