The seats are pitted real deep. I didn't know how deep the pitts were untill I went to smooth them out, then the carbon wore away and showed what it was hiding.
The valve seat on the head is fine but the valves are all pitted up where it touches the head.
With all that pitting there had to have been a good bit of compression loss.
The engine I got the heads from was running lean for a while because of a bad MAT scencor.
It also had a lot of miles on it too.
They look like they got heated up real good also.
The intake valves are all good.
Any one know what might have caused this?
Burned valves?
Can I cut them down to fresh metal?

 

dunno what caused them but I know I'd just go get some new valves bud. Even if you can work them it'll cost a lil and a new set only runs like 80 bucks, and thats for Manleys.

 

An engine run lean can have some very high exhaust gas temps. You can actually start to "burn" the exhaust valve. The hot exhaust heats up the valve, the valve closes and tries to "weld" itelf to the seat. Then it opens again and little chunks of the valve can get ripped of.

New exhaust valves, freshen up the seats, don't run lean again.

 

That's what it looks like but the seat looks good.
I put them on the drill press and cut them down to fresh metal.
I'll hot hone the valves to the seats when I'm done.