Pulled motor due to white smoke/oil in exhaust and no compression on #3. Pics...
 

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So what exactly happened - besides the rocker breaking?

Doesn't look like anything is hurt too bad.

My tuner said valve seal came loose and retainer starting beating the seal which broke the rocker. I have very limited knowlwdge about engine internals. Any idea why this would happen and how to prevent it from happening again? The motor only has 24k miles but we already ordered forged internals expecting it to be worse so we are going to go ahead and rebuild while its out. Was only at 650rwhp when this happened and under 500 miles of it being boosted.

Hard to say, probably a bad seal - looking at the springs, it looks like someone already replaced the springs/seals/seats so a bad or incorrectly seated seal would be my guess.

Looks like you may be able to simply put a new seal and rocker on and keep trucking!

The car came with a small ECS blower cam installed by ECS.

:iagree:

No it needs a rebuild with forged internals 😉

And a bigger blower.

Ditch those rockers and go with stockers with bronze bushings.

There were some batches of Ultralights that were prone to breaking.

But given there is other damage, it would seem that something else failed and that caused the rocker to break

If the rocker had just broken on its own, there wouldnt have been the other damage.

I have turbos :cheers:

Those are the older run of YT rockers. See post #24 picture 1

https://www.corvetteforum.com/forums...post1582040512