alarm intermintely went on and off after a short full throttle run.. i was not on the boat it is my buddies... they turned it off and it fired again no problem a few minutes later no crank hydrolock

Headgasket?

no water in oil no milkyness

Were you loading it onto a trailer when this happened. I have noticed when people get there trailers a little too deep and get the boat on it sinks the back way down in the water and a chance to let in flow in, doesn't mater running or not. and it fills both rear cylinders

1st Thought it sounds more like a cracked exhaust manifold or riser. Your not exchanging fluids. water to oil. AND a head gaskets has to be real bad to fill a cylinder that fast

nope just coming back to the slip

i think headgasket after a hard run. best scenaro intake.


is there anyway the manifolds or risers could cause this on a 496

What did the plugs look like when you took them out besides being wet. What color were they?

so you thinking cracked manifold ?



supposedly it has brand new manifolds no indication of water in the manifold when i pulled the riser

appreciate all the input

plugs clean just wet but i just glanced at them

need to crawl back down in the bilge to verify the plugs

Just trying to rule out the easy stuff 1st

do a compression test if you can, that will tell you