please ignore my last post F.., am i ever button stupid.......
jeff you said the motors had been idle for 4 yrs...
assembled and idle??????

Dry stellings. No reversion

Assembled with the valves closed. Means no rockers installed. Engines were sealed.

I am taking off the oil coolers and going to run it tomorrow set up old school like a jet boat. and pull the t stats out.

I can monitor everything with the guages and regulate the temps.

I the problem goes away, I know it is in the coolers. If it is still there, then I know to keep looking.

Most likely this is in the engines somewhere. There is a head bolt leaking, or a head gasket.

intakes are fine. Pulled them. no leakes there. new gaskets tonight. I glue on both sides, so I could run them without the bolts and they still wouldn't leak, but it never hurts to check.

Two tests come to mind as needed at this point. First the coolant system pressure test. Hopefully you run closed cooling. After that I'd do a compression test to confirm you don't have exhaust valve issues.

Are you sure it is not the intake manifold gaskets? Condensation alone will not add that much water to the oil. You have a leak. I would not advise running the boat until you fix it.

Jeff,
I dont know what your financial position is but ..... if the oil looks like a chocolate milkshake, I would personally not run the engines another second without finding the problem. If you do, good chance you will be building a pair of engines

If you insist on it, at least drain the oil and put in some 15w40 Mobil 1. That might give them a better chance if the problem is still there.

Just my opinion,

Bill Koustenis
Advanced Automotive Machine
Waldorf Md

He did the intakes already BZ

im thinking you also have a leak somewhere
most likely a head gasket
coolant system check is easy enough just dont whamy the pressure to much
also a posibility is a rear main seal
unlubricated they can deteriorate after time when they dry out
is the bilge bone dry?

When the engines sat for 4 years did they have any water in them.Were they don't on water was were they were keeped heated?Its strange that its both motors.

Just noticed you are from Texas so freezing is unlikely is there a way you can pressure test the coolant passages in the block?If its not the intake its more than likely head gaskets as I doubt both engines have cracked/heads or block.The exhaust is dry so doubt that is the problem but don't know much about dry exhaust.

only do one thing at a time,just bypass the oil lines going to the coolers first(this way will tell you if the cooler is bad also by monitoring the inlets if theirs water coming out of them)...run the boat,if its still leaking then remove thermostats..when i check for internal leaks i remove the hoses @ the thermostat housing and loop the outlets together with another piece of hose..i have a doohickey made up with a pressure regulator and a gauge,,i install it to the water in on the engine and hook the other end to a garden hose and turn the spigot on,,i will test it starting at 15 psi,that should get the ball rolling if i dont find a leak then i run it up to 21 psi..first check with he engine hot,if no leaks then check it after a few hours..i also have a vacuum set to but you cant tell were the leak is coming from..

ps watch the cooler,you could fill the boat with water if their bad..