[Mart]

Art, are you rethreading a pipe thread to 1/2-20? To make it a face seal instead of an olive (as we call them) fitting?

I actually went out to the garage (it's nearly midnight here) to check a 94 is 1/2 -20.
I began to doubt myself.

so, if I have this right, a stromberg has a brass fitting with a 7/16 thread into the carb. This brass fitting takes the normal 1/2" "ford" nut. this is adapted into a worn out or damaged holley by threading out to 9/16 and using an insert to adapt down to 7/16 to take the brass piece robbed from a stromberg?

I can see why you're using the lathe to get you out of a mess.

Mart

edit: "standard" (UNF) for 7/16 is a 20 tpi pitch. 24 is used on weatherhead fittings like brake pipes for 1/4" tube nuts.