I Might Have Found Something Pretty Cool.....

LOL, if l could, l would. My PC went bonkers a while back, & l haven't replaced nor attempted repairs yet. This flip phone is lucky to give Me anything, but better than nothing. Interesting piece for sure. I wonder if that was a late attempt in iron before the Al-U-minimum one that was basically a 6cyl pushrod version of the 2.2/2.5 head. That unit looks like they emulated the 258ci. AMC-6 chamber.

It kinda does remind me of that, too. I agree with you about the casting number, BUT the ONLY reference I can find for it is in lists. No description, no pictures. Just the number. Have you found anything other than that?