Griff

Like steve said, the water is sitting in the bottom of the oil pan. It probably didn't have time to mix up a lot with the oil. Most likely the bearings are trashed now and you'll need a complete rebuild.

Smitty

Oil floats on top of water !!!

Itsallgood995

Drained the oil & there was water in the bottom of the pan. Not much though, maybe a quart or two max.

I'll pull the heads & check them out tonight.

454/502 HO cam 24502611 6 192, 2611, 261668-
210-230*
511/540”

Reversion shouldn't be an issue w/ the above cam, huh? Its ran for 100hrs so seems like it would have been a problem sooner if there was a chance of reversion.

Thunderstruck

You overheated the motor right and found water in the cylinders? Have you had water in the cylinders before?? Pretty clear cause and effect to me. One thing would be to try and see if the exhausts are cracked from the overheat before taking the heads off. Exhausts have to come off first anyway.

BTW, not much water in the pan??? A quart or two is a lot.

jeffswav

If you overheated the engine you could have warped a head or blew a gasket. Take the heads to a machine shop and have them checked. Reversion would act different than what you are seeing. Reversion would milkshake your oil and you would see moisture in the engine not water in the pan. What engine do you have? I have a complete set of heads for a Gen V 330HP with a fresh rebuild. Good luck, I have been there.

Itsallgood995

pulled the heads. both head gaskets blown. no noted cracks on the exhaust, heads, cylinders, or cheese under the valve covers. With a straight edge I couldn't see any signs of warpage on the heads. I'm going to take them to the guy who ported them for a second opinion.

the motor is a stock gen V short block, w/ ported vortec heads, 496 exhaust, 454HO cam, performer manifold.

I wastn't in the boat when it stopped. I first thought it was just a dead battery so I never noted the temp. This is my best guess so I want to rule everything else out so it doesn't happen again.

stevesxm

i think it extremely unlikely that failed head gaskets will put clean water in your cylinders sufficient to lock them up and run down into the pan.

but who knows. i suppose its possible.

tms1155

only takes a small amount of water to lock it up.

Thunderstruck

Probably also pushed the head gasket into the valley where the bolt pattern is lacking on a BBC which actually is sealing the water passages. Definitely get a bunch of water in the pan with that scenario. Don't know about how much water will leak into the cylinders with a head gasket problem but I got a quart of water in the oil pan with an exhaust manifold leak by pushing past the rings.

Itsallgood995

I'm open to suggestions? I noticed the Knock sensor was disconnected when I tore down the motor last night. My guess is the default is the reduced timming mode. It didn't seem to run as strong that day so I'm pretty sure it was in the reduced timming mode.

could detonation somehow cause the this?