It must have been one employee or one work station as not all serial numbers of engines made or remanufactured during the calendar period apply. I am looking at a factory new IO-550B on the front of a Bonanza that was manufactured in January 2022 and the SB doesn’t apply based on engine s/n. Meanwhile we have a factory new TSIO-520 deliverd from the Continental two weeks ago still in the crate that the SB does apply to that one. I advised the owner to send it right back in the crate. Who would tolerated tearing cylinders off a factory new engine with zero hours in the crate in the field while potentially affecting cylinder stud pre-load. For close to $100K to get a brand new engine delivered on the very date where the problem hits the press is just not acceptable. Surely Continental knew that serial number applied before they shipped it the week before as at that point they were well into writing the SB and designing the inspection tool. Or there is a big devide between engineering/fleet support and sales. Which is a problem in itself.