I've pulled many a 440 out of motorhomes. The general rule of thumb is from '72 thru '75 they used forged cranks & six-pack rods, & lots of 'em came with a windage tray. Starting in '76 they switched to cast cranks. There will probably be some that say they've seen steel cranks in the later motors; I have no reason to doubt that. My own '76 Jamboree has a cast crank 440.

One thing I like about the MH engines is they rarely have a lot of miles racked up on 'em; most of the ones I pull out of the locals yards have less than 60k. Usually the bodies give out long before the drivetrain. The result is a nice block with minimal ring ridge. I have 3 spare bare blocks with less than 60k on them with hardly any ridge at all.

Up til '72 most big block Mopar motorhomes came with 413s.