What crank 1970 318?

Garrett Ellison said

I've never seen a Chrysler crank that didn't ring or hear one that made a thud, cast or forged. Must have been some really spectacular steel/nodular iron poured when they cast them.

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It's a trained ear thing along with the marks. There are two distinct sounds maybe thud isn't accurate. But the cast is more of a "dead note' or using musical terms the forged crank will "sustain" or ring longer than a cast which wont ring long at all.

As far as being good steel ,it was .These cars are from a time when Amerca was truly great, steel and cars and parts were made here or in Canada across the great lakes from Detroit. This is one reason why I love these old cars...:)