So my port engine has oil in the exhaust manifold. I see a oil sheen when running on the muffs. I took the drain plug out of the bottom of manifold and I have oil and water mixing. It runs fine plugs look good. I bypassed the oil cooler and still have oil coming in. It's not intermixing with eng oil just in exhaust manifold. Could I have a cracked intake manifold?? I ran it for hour and half and was down half qt oil. I would think if I had that much blow by it would be on the plugs and running poor. Any ideas?

Is your engine oil milky

No. Oil is clean no water in it. Only place I'm getting oil is in the exhaust manifold.

Power steering cooler maybe? I'm having a similar issue. Please report back if you figure this one out, I'll do the same.
Mine runs fine as well, plugs look good as well. New cap, rotor, and plugs. Compression was checked yesterday and all were between 155-160 psi without squirting oil in the cylinders. My next step is bypassing the oil cooler.

How about telling us what engines you have and how many hours are on them.

Hp465's 370 hours for me.

Mine is the oil cooler. I made a section of hose with barbed couplings to bypass the circulation water around the cooler. No more sheen on the water and oil in the bilge.

Most likely a cooler. I've seen oil galley's crack, but they usually dump way more oil way faster than what you are describing.