Motorhome 440's... factory seconds?

I guess it depends on how you define factory second or how the OP defines a "re-poured" block. Obviously you can't re-pour one once it's been poured but you can pour a new one. Personally, If the factory screwed up a casting or machine work and then did what was required so they wouldn't have to scrap the part (ie: bore it oversize, grind the journals smaller, etc) - then to me, that's a second. Doesn't mean it's not usable but it's still second. Many would agree that Chrylser had some of the worst machining in the industry back in the day. Anything to save a nickel. Motorhome engines may have had different engineering specs but I have a hard time believing they got top of the line production parts. Not saying they got seconds or rejects as a matter of policy either. My point is, anything's possible.

I bought NOS plastic trim parts for my projects from the dealer back in the 80's and there's no question, they were seconds because of defects found. Still usable but they wouldn't have found their way into a production line vehicle.