I received this note from a rep. of Moore & Wright, confirming some list
member's correct identification of my "mystery tool"
(http://www.members.shaw.ca/bilbo/tool.html)

Looks like it may have some Vanagon use after all!
Do I have the moxie to try it on the inlet manifold I have on the bench
right now? :)

Alistair

> Good morning Mr. Bell
>
>
> The tool in question is a "Half round scraper" it is used for
> removing metal, for instance when blueprinting an engine.
>
> All connecting faces of inlet and outlet manifolds would be scraped to
> remove
> any faults and burrs that would cause air and fuel flow eddies.
>
> Not to be confused with a scraper used for woodworking.
>
> Best regards
>
> Jeff Sutton
> Moore & Wright