Ok, I am normally a 240 person and I was TRYING to do the trick where you run water in through the intake via a vaccum hose and it cleans out carbon from inside the engine.

So I try this on an 850 whiteblock, I use the vaccum port on the right of the intake manifold where there are two ports, I use the top one. I start the engine and it sucks the entire jar of water in in about 2 seconds, klunks, and dies.

The engine will not even turn over now, does anyone have any idea how much damage I have done and what it will take to fix it?

This trick always worked perfect on redblocks, I don't know if it just doesn't work on whiteblocks or I really pickes the wrong vaccum port.

Pull the plugs and hit the starter. Get as much out as possible. Put the plugs back in and start it and get to operating temp for awhile. Change the oil.

Now that could be deep deep trouble..notice the keyword here is COULD, so dont fret yet. Have the block opened and cylinders air dried. If you can do it, the better else it may be about 500-1000, but thats cheaper than buying a new block. If it is what I believe then the pistons could be warped...happened to a co-worker and he had to get a new engine. Anyway before you resort to that, try the above.
Good Luck