Whattheheckisthis ?

[Grumpy Gator]

Another odd tool I found in the bottom of the box.
It says Sioux 706D on the fly cutter head. My best guess is a valve seat cutter.
***Thanks********G********

 

[genec]

It kind of looks like one, that should have a guide stem on it, and was that designed to bolt down to the head?

 

[Rbeckett]

Valve seat cutter for an old L head motor. Really an oldie, as in antique fer sure.

Bob