Howdy Gang,
We have a 496 engine in a Jet boat. The boat was washed down the river during a flood. It sat all winter long before we were able to remove and strip down the engine.

The engine had just 14 hours on it but after the flood it was full of muddy water.
We scattered it and cleaned everything- new bearings --plastigauged to check the factory specs. New gaskets and head bolts.

we did lap the valves, when the engine was put back together we spun the it over while it was still out of the boat and got good oil pressure with the test gauge.
Everything looked real good or so we thought.


we just put fresh water in the header tank but hear the water leaking into the base.


Any idea where to look for a leak-- or some method to pressure test it.
I haven't tried to pressure test the cooling system and could plug all the ports and test it that way. Maybe adding a dye to help .

I had a thought that maybe the head gaskets were not the correct ones.

Just want some ideas before ripping it apart
thanks
Hank
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