I know a lot is known and discussed on here so I am hoping someone has enough history to answer the question. I have seen a number of 440s in 72 cars that have the thin steel crank balancers so I assume steel cranks, figuring them to be left over engines from 71. I starting thinking today for some reason about what piston would be in them. Has anyone ever tore down enough of these to draw any conclusion, is there a date break to look for? The reason I ask is there is still a few in old boneyards in my area and I wonder if I should pick them up just because.

Thanks in advance, Kevin