I had a INCONEL valve do similar, I had 2 engine builders one being Gellner say they never saw INCONEL do this....

Full force, you were the first guy I thought of when I saw his photo of his valve. I knew I saw one just like that before

ezstriper; I use REV valves, Racing Engine Valves on the intake valves!

Full Force; ****, that dont look good.. But we are lucky that they are in one piece!! But that is a exhaustvalve, correct? Did you find out why that happened?

at the time my engines had small chitty fuel filters, when I put power in my Cig, things got loose in tank and clogged it causeing super lean issue, glad I had Inconel, no other valve woulda held up to that, yes exhaust...