Water mixes with oil without engine running

Hi. Thank you for the reply. Previously I did a pressure test with a pressure tester on the radiator and it would not hold pressure and water leaked through the throttle body vent port as I pumped. I call it a vent port as several gm 3800 throttle bodies I tested with water leaked water when removed from the upper intake plenum and I poured water into the port. Tech support at Dorman reports no water should flow through the oval port of the upper intake plenum into the throttle body vent port.

At one point the engine was hydrolocked. I removed all six spark plugs and was able to crank the engine. Water sputtered out of the spark plug holes.

I can confirm water is getting into the cylinders.

Thank you for your reply. Consider the screenshot. On the intake manifold near the EGR stovepipe there are 2 round ports through which coolant should flow. There is 1 oval port through which coolant should not flow. I understand that gases should through it. On my engine when I add water to the radiator I hear water gurgling up into the engine and flowing out the three ports near the EGR stove pipe. How can this be? This evident without the upper intake plenum attached.

The red straw indicate where water is flowing through. No water should flow through here, correct?

When the throttle body is attached and I add water to the radiator water flows through this port and into the air snorkel.

Water is mixed with the oil, but I have not started the engine since an oil change.

Yes! The intake manifold is allowing water up? The lower intake manifold gasket is a Felpro and is new. The intake manifold big aluminum block sitting on the valley is a Dorman. I removed the intake manifold to check the gasket. Looked good.I reassembled to specification, but water still leaks. Dorman tech support thinks my head gasket is likely done.

When I remove the lower intake manifold I see intake runners and water jackets on the cylinder heads. On the rear bank cylinder head I see a small port tucked up high that is not a water jacket. It seems to be a air channel. The lower intake manifold gasket makes space for it; does not block it off. Seems like if water flows through it is a tell that the head gasket is done?

I will not start the engine until I can get it to keep water and oil separate.

Consider the rear bank cylinder head. Lower intake manifold gasket is in place. There is a round hole on the gasket between the intake runner and the water jacket. Why is there a hole there? I think water is come through that hole through the lower intake manifold through the upper intake plenum and through the throttle body. But why?

Prior to the repair I noticed sludge (water and oil) on the throttle body screen. My air filter was also wet and had a circle stain like it got water through the snorkel on it.

The engine had an external water leak on the drivers side. The engine got overheated just before the repair.

However no water in the oil until after the intake manifold gasket, intake manifold, upper plenum, and upper plenum gasket replacement. Not sure if it all went out the tailpipe.

I will try the compressed air into the spark plug holes with the intake manifold and intake manifold gasket removed.

Thank you!