Hello HT6, Chris and Contributors

Mal, I'm in the conversation too.
This is great information.

Of course, Standard spec. engines were supplied to many small OEMs
that would not show up in major account documents.

Could you please tell us what 'OTS' stands for?
Could you share with us the docs you have that state 584X is a STD Spec?
Mate, Anything for the record adds to the story we don't have.

All very Villiers.
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JACK