You only have to wipe one lobe on the flattappet cam to remind you why you made the mistake of not going with a roller in the first place


A roller costs a good deal more, but it also takes away the annoying halfhour break-in period of a fresh engine or cam install. Oil selection becomes a little less critical aswell.
You can just start the engine, set timing and carb adjustments and then break in the rings during a couple of firm drives around the block.