In a message dated 00-02-17 23:29:09 EST, you write:

>   OK John Alon's oil vent is as new. Cyl. are 70 hrs. And compression is
78 
> / 80 So why is the belly always oily and drip about 20-30 drips after a
X-
> country? Warren

Could be the vent is positioned incorrectly in the slip stream.  A 1/2
inch 
difference can make a big difference.  Could be the rings have not seated 
properly.  Could be the fitting on the case is incorrect.  Could be the
crank 
seal behind the prop is leaking and allowing the case to pressurize.
Could 
be.....

There was a good article in Light plane Maintenance 6 months or so back
that 
addressed this.

John

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