Is this a cast or forged crank?
I've seen 340 and 440 cast cranks and their forged counterparts. Easy to tell the difference - the more clearly defined, sharp edges, the much narrower parting lines, etc. But other than maybe the narrower center counterweight or the narrower rod bearings, I don't believe I would be able to spot the slant six cast crank as being a casting. Unless there's something visible in the flesh that doesn't show in the photos. As I said, I've never held a slant six cast crank, just maybe seen pix. Anyway, here's another illustration I pulled off the web:
I've seen 340 and 440 cast cranks and their forged counterparts. Easy to tell the difference - the more clearly defined, sharp edges, the much narrower parting lines, etc. But other than maybe the narrower center counterweight or the narrower rod bearings, I don't believe I would be able to spot the slant six cast crank as being a casting. Unless there's something visible in the flesh that doesn't show in the photos. As I said, I've never held a slant six cast crank, just maybe seen pix. Anyway, here's another illustration I pulled off the web:
