5.7 vortec overheated

[doubleb]

newbie here. i just bought a 2003 jetboat with only a hundred hours. the previous owner forgot to open the valve to let water in the engine. once overheated the idiot opened the valve and let the cold water in. it is a vortec 350 roller motor the only thing that makes it marine is the intake and exhaust and waterpump block off. the head gasket was blown apart by the steam i am guessing. I had the heads magnafluxed and decked just to make sure. they were fine. i am leary on the block. it looks fine, i see no cracks. the cylinders still have the factory swirl marks. it did push the freeze plug out though. could that have saved the block? were would this block crack if it were going to. any info would be apprieciated. p.s the oil looks super clean. there was a little milkiness in the lifter valley but i think that was from all the steam.

[tokymon]

most like to crack between the center cylinders they get the hottest

there is some products for checking this i dont know any off the top of my head right not though

[hog]

Ithought the marine Vortec 350's got different main bearing clearances?

peace
Hog

[doubleb]

I talked to indmar the people who put it together and they told me that they just buy crate engines and put there stuff on it

[hog]

I talked to indmar the people who put it together and they told me that they just buy crate engines and put there stuff on it

Nice, thanks for the info.

peace
hog

[THEFERMANATOR]

GM has a seperate engine division that handles marine engines. Most all of them since 97 are built off of the infamous 4 bolt main blocks that came in 96-00 3500 trucks. They only differences was that they used better head gaskets in them to resist rotting from saltwater, and a different camshaft along with some got a timing cover without a crank sensor hole in it. VOLVO would take them and put COMP roller rockers in the 320HP version they turned out, but other than that they are all pretty much GM inside.