[Billla]

Yep, only the high nickel, high tin blocks have the 010 (10% tin) and 020 (20% nickel) casting marks under the front cover - here's what those marks look like. I tore this block down and it had virtually no measurable bore wear after 160K+ miles!

Cast cranks can be distinguished from forged cranks by the parting line on the nose of the crank - a wide parting line means forged, thin means cast. I can upload a picture if that's not clear.