Ok so here's some info, I got a 85 searay with a 4.3l omc, but I recently got a rod knock, I am wanting to swap in a 86 omc complete engine now I know a lot will be the same, the only thing I am really concerned with is in the 85 it's a 2 piece rear main seal and in the 1 86 it's a 1 piece which...
