Cracks around wastegate opening on manifold?!

[CrashBandit187]

I've recently pulled my motor for a few things. One being a new turbo. Upon removing the downpipe, i saw my wastegate opening had a small crack.

Picked up a second complete motor for parts, manifold on that has cracks around the wastegate opening also. Is this a common problem? Both setups have roughly 120k.

[canadianA4B7]

Fairly common. Heat cycles and improper cool down is my guess. I have a good number of cracked manifolds from the turbos I’ve rebuilt.

[dalmation53]

This usually happens when people let the turbo get really hot on nice pulls and then park it and shut the car off. It's bad for the life of a turbo.

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