I have a friend who has a 440 powered '74 Winnebago class C motorhome. The engine is tired and needs a re-build, burns LOTS of oil. He has a fairly decent 440 laying around that he could freshen up and drop in (to save on downtime) but the guy at the truck repair shop that he brought it to told him that it will absolutely not interchange, the engines are totally different. Am I missing something here? To the best of my knowledge, the only differences were the cylinder heads with water jackets around the plugs and an occasional oddball water pump housing. I took a quick look at this engine (still in the chassis) and I can't for the life of me see any visual difference.
Anyone know anything about these things? I know motorhomes have become prime targets for donor engines. I figure if a motorhome engine will drop into an A-body then a standard passenger car engine should fit into a motorhome chassis.
What's the real skinny on motorhome engines?