I had bought as advertised for 65-67 442. Please see pictures. the older/rustier looking one is from a 66 425 Toronado motor. It matches the balancer on the 67 442 (400).

The black balancer shown here has a different weight size and a thinner front flange.

Since I guess I'll try to sell the one that doesn't match, I need to know what it is. later model Olds V8? any knowledge? Thanks.

The older one cleaned up better than I expected (after I took these pics, there wasn't much reall pitting), so i may have it rebuilt as i'm concerned if I do a 'swap' on a rebuild, I'll just get something else that doesn't seem to fit.

Thanks,

 

If you check the casting number on the backside, compare to this, if it matches you hit the lottery, if it looks similar, but not as thick front to back, then it appears to be a 69 350. But put a tape measure as in my pics. All the best

 

looks 68/69 350 to me. definitely not a W-31 balancer.

 

...but we can all hope.