Got a response back from the guy on the valves...

"These are Inconel valves in Manley bags that came in a 100 piece bulk pack Manley box. Manley does not etch a part number on their valves, only "MANLEY" ON THE TIP. I have sold many sets of the 11587. Check out my 100% positive feed back."

Hmmmm. It might take a leap of faith to buy them. Wish there was an easy way to positively identify an inconel valve. Might have to call Manley to see if they have a way to verify.

Mine say MANLEY HO811 on the tops, if he has lots of good feedback hes probably not gonna fuk ya, just check them when you get them, the magnet will grab till about halfway down, then not...

11587 is my part number, they are standard 1.88 for most heads..

I wonder if that is a date code or a batch number? I might call Manley tomorrow and see if they can offer some insight.

He is selling them for $200, including free shipping. That is a damned good price - I think I paid $160 for my REV's, and they are not inconel. Location simply says "Great Lakes area"...

I am not sure....