Merc. 7.4 smoking from breather hoses

Took the heads of today, no clear sign of crack or bad gasket. I will drop them of at the engine shop tomorrow and see what they find.

I pulled the intake of today, there is a lot of grey goo i the v of the engine but I see no sign of water in the oil I suked out of the oilpan.

There is a little corrosion on the gasket surface on the intake near the water chanel.

I know this sounds silly but is it possible the crankcase is overfilled and you're slinging oil all over the place at higher RPM's?

The two hoses from the valve covers are not blocked they mount on the flamearrestor on the original bracket so I think that i how i should be.
Sparkplugs all look light tan with i little carbon buildup on the buttom. I have had a camera in each of the cylinders and they all look the same colour
I will remove the intake manifold tomorrow and see how it looks.

My guess: intake gasket leak...leaking water to intake...could be head gasket ...fact is water is getting into the engine it should not steam at all...I'll bet ya got peanut butter in the valve covers...its not condensation either

Hi all.
I just purcased a baja force 250 to use when we are to many to fit in the mustang.

I thought i'd post here as I have always found the answers i neded.

It has a mercruiser 7.4 gen V with alpha one drive.
Seawater intake through the hull. Edelbrock performer intake 2,0, new edelbrock 1410 marine carb, new exhaust manifolds and risers.
It has through the hull exhaust tips with silent choise
New impeller and housing.
New oil and filters.

When i run it on the hose it runs fine with no smoke from breather hoses.
No smoke from exhaust
When i pull the oilfiller cap while running there is no puffing or smoke/steam.

When i put it in the water it starts to smoke out of the breather hoses after 5-6 min of running at 3200 rpm. If i run it at 4600 rpm for 3 min or so it vil smoke so badly that i have brown smoke comming out of the enginecompartment and the engine loses power, if i open the hath a little so the smoke can clear the engine dose not lose power.
After a 4600 rpm run i have a little oil blown out of the dibstick.
When i come down to idle to go back to marina the smoke keeps blowing from breather hoses. Low rpm = little smoke high rpm = lots of smoke.
Engine runs very well the hole time. You can put a glas of beer on the intake with out it shaking at all.

Compression test.
152
152
148
152
150
142
148
152 psi.

Oil dose not show signs of water on the dipstick. There is a little tan oil goo in the filler cap and breather hoses.

The right side exhaust is steaming and the left is not when in the water both risers are cool under all rpm.

Engine tep. 160
Oil pressure ca. 40 at idle