I'm looking at potential blocks for a future stroker build. Ran across one from a late 70's van with 3870230-360-1 on the side of it. Does the -1 have any significance or imply better quality? Thicker cylinder walls or less core shift? I think it has something to do with being on the first run of the mold? Or is it pretty much a crap shoot, no matter what number it is?
