Well, I've read about it on this forum, but never thought that it could happen to me. Just put 2 hours on new engines trying to find the best prop. The next day check the oil and found milk shake on both sticks, starboard had milk up quite a ways. The engine builder is coming in the morning to change the oil prior to taking back to shop!

A couple of theories - the excess water pressure forced water pass the manifold, water reversion through the exhaust? What does everyone think? The builder wants to do a leak down test. Help.............

http://www.offshoreonly.com/forums/s...take+manifolds

What is your water pressure?

What is the cam profile? What exhaust are you running?

I Just Built A 502 An My Oil Is The Same Way I Put A Pretty Rad Cam In It An I Have Stock Mainifolds. I Did Alot Of Idleing Around On The 4th Think It Might Be From It

I had a Chevy Monte Carlo that had milk on the stick
Turned out to be a blown head gasket. Let's hope not in your case because I wound up f-ing up the crank shaft. My wife was driving that car and after about two weeks she told me that the temp gauge kept going up and down.

Let's see, the engine builder came and changed oil on the port engine - not a lot of milk in the oil. The starboard engine was another story - we couldn't get the oil to come out because it was like grease. Limped to the ramp on one engine and saw the boat being pulled away.

I'm not sure of the water pressure, but that is what most are saying. I didn't know of any problems with the Bravo drives? He said it wasn't reversion. And, I haven't heard back from him.

The cam is a Crane 139651. What do you think about damage to the engine?

What water pressure should I be running? Is anyone using a dump tube? What brand are you using and how is this set up? Has this been a problem with Bravos? Appreciate your help.

What kind of exhaust system and how is set up ?

30 psi is all you need, invest in relief valves. Very few head gaskets will hold up to the high pressures developed at high speed, I saw it sated on anothe board tha 100+ psi was a possibilty running up near the 3 digit mark. Even on stock rigs many times you will see rust weepage can be seen along the head gaskets.

Phil