08-19-2025, 03:19 PM

oldman

Senior Member

Join Date: Oct 2003

Location: McKeesport, PA

Posts: 152

Stamped number where the block casting number is

I am currently working on a Pontiac 400 RA IV engine. I am a little concerned about the casting number. It is stamped on the passenger side behind #8 cylinder. I've never seen the number stamped. I've only seen it cast into the block. Has anyone ever seen this? The engine is in the car so I can't look to see if it is 4 bolt mains.

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