Valve adjustment tool?

[bonneyman]

Can't remember if I posted this when I got it, but I just uncovered it in my car tools again and can't remember what it's for. About 5 1/2" long, hex opening looks to be about 13/32". The only writing on it is RAP  612. Any ideas?

[Papaw]

Yes. For adjusting valves.

[Bill Houghton]

Yes.  Interesting variant of the tool.  I've got one of the basic versions, which takes interchangeable standard sockets.  Mine's got a flat screwdriver tip, though.

They're said to be dynamite for Chevy small blocks, which are adjusted while the motor's running.

[Lostmind]

I think it's for rear bands on auto trans.
Slot to wide for valves
You loosen the lock nut , tighten down the adjuster and back off a certain amount of turns.

[Papaw]

That might be more likely. The adjuster for valves would be "male" rather than "female".

[bonneyman]

Great!

Can anyone use it? It's just gathering dust in my car box.