New engine tragedy, Broken valve stem Options

[Jetsetsurfshop]

On my first outing with the new engine tragedy struck. While giving it a little bit of RPM the engine made a noise I never heard before and then dropped a cylinder. Limped it home and this is what I found today.
That's the top of the valve you see still with the keeper! Damn.
Anyone have any thoughts on what happened here?
Everything we did was the same as the last build except we installed a more aggressive camshaft.
(IMG:style_emoticons/default/headbang.gif)

[McMark]

I would love to see the valve train geometry before it broke.

This seems like one of those situations where we realize once again that an engine is a combo -- it's an ecosystem -- and one change can have cascading effects. I wouldn't be comfortable building an engine with that fast of ramp rates, using larger (heavier) valves that was meant to rev. If someone came to me with those specs, I would say, "Let's spend a lot of money on valve train lightening."

Is component mismatch your problem? Dunno.
Is incorrect setup your problem? Dunno.

But building an engine that aggressive takes a lot of checking and planning to get right.

When you can, post some pictures of the valve area. Maybe there's a clue in seeing the rest of the valves.