[SEL] OT again - engine casting question......

[bill at antique-engines.com]

Question about engines, but not antiques.
IT's pretty well known that IH used some AMC engines in some of their
vehicles, specifically the 401 AMC engine.

AMC built their own engines and supplied them to Bricklin and IH for a time.
(290, 343, 360, 390, 401)
However, one fellow has happened across a 401 block that has "IH" cast on
a transmission mounting ear on the back of the block.

Does this mean that IH cast the block, OR, AMC cast the block FOR IH?

Does any IH fan here know for sure?

I'd expect that AMC cast their own blocks and probably cast IH into the
blocks/engines they sold to IH but would like to know the facts.

Bill