What would cause an intake manifold to blow off the engine

Moderators, I am not sure if this is High tech, but I didn't know where to put it. My buddy had his buick turbo blow the intake off the engine, I suspect he may have been pushing to much boost, or maybe the timing is off. What would cause such a violent explosion, he said it made a large bang.

I've seen nitrous do the same thing. That's only after a major backfire.
I would assume it would be possible with to much boost also.

Backfire http://web.camaross.com/bb/smile.gif
Steven

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383 Inches of stroked turbocharged fun.
If one is good shouldnt 2 be great????? :D:D:D
TURBO=TORQUE
TORQUE=FUN
Ask me about Burhead Headers If you are gonna use them
My Car (http://groups.msn.com/Zturbo)

BAck fire

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Ellis
Team Captain
Team North West F-Body
www.teamnwfbody.org (http://www.teamnwfbody.org)