intake manifold sweating

[Beer-30]

it worked great,but now i have condinsation in my valve covers.
Unless you either:
A - go on longer cruises
OR
B - raise your oil temperature
OR
C - Both A and B,
You will have condensation in your oil. Part of the reason for todays 195* thermostats is to keep the oil warm enough to "boil out" the contaminants. Short-trips and low oil temps cause oil yogurt.

[DUCKY]

Burnuli's Principle..."A column of air moving through a restriction increases in velocity and drops in pressure"
The drop in pressure (intake vacuum) and the latent heat of evaporation (liquid fuel atomizing) decreases the surface temp on the intake manifold below the dew point and causes the moisture in the air to condense. Same reasons carburetors "ice up" on small aircraft and cars in very cold temps, just in a different location.

[SmokinLowriderSS]

it worked great,but now i have condinsation in my valve covers.
What engine temp are you running?
Too cold of oil/engine temperature causes this one, and this one is NOT really a good thing.
As ultra said, longer cruises to raise the oil temp above boiling, engine temps arround 140/150 running, 170+ idling help.
This happens to a lot of guys I hear when they are running too cold/arround 100 degrees.