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My cousin and I did the same thing to his new crate motor with vortec heads and a new rv cam. it blew the rings right out of the motor. This was a brand new crate motor strait from the gm delership. A engine builder told us that any crate motor you buy will have cheap parts in it,thats why they can sell them for so little. I would check into it a little further before proceeding.
I would have to disagree on them selling crate motors with cheap parts for cheap. The are slightly more than a rebuild, but they do have a warranty. Have you ever torn one apart, it is the same stuff that came in them stock. the 300hp motors are not the same as the generic replacement either....