Recently ran into head #22 w/ Number upside down.

Has anyone EVER seen the Casting # on head upside down?

Australian engine?

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

Or spinal inversion?

Just look at the number from the opposite side of the head and voila!

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Don't Chrome them; polish them

Unlikely a fake since making a mold and sand-casting is very expensive, so probably done at only one foundry. If a stamped number, then likely a worker error. If the numbers are cast-in, that could also be an error since I think they nail the PN plates to the mold, as you see the nail-heads in older cast blocks.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans