Small Engines (Lawn Mowers, etc.): craftsman 5.0hp 22cut blowing oil up through cyl hd

Question
hi eric I have a 5.0hp craftsman techumse engine 22 cut and it is blowing oil up through the cyl hd. afriend of mine told me there is an engine vent that is possibly plugged however I cannot see a vent on it is this possible. I was thinking  it may be a ring issue. I would greatly appreciate your thoughts on this issue. thanks

Answer
Is the engine oil level too high, over filled with oil?  Does the oil smell like gasoline or is the oil really thin and runny?

There is a breather on all engine.

Service manual:

http://www.smallenginesuppliers.com/html/engine-specs/tecumseh/Tecumseh_L-Head_E

From page 78
BREATHER PASSING OIL
1. Check the oil level, make sure the engine is not overfilled. Also verify that the viscosity rating on the container of the oil being used is to specification.
2. Check the angle of operation. Avoid prolonged use at a severe angle.
3. Check the engine R.P.M. setting for excessive R.P.M. using a vibratach or other tachometer and compare it to the R.P.M. settings found on microfiche card # 30 according to the engine model and specification number. Adjust the high and low R.P.M. as necessary.
4. Check for leaking or damaged gaskets, seals, or "O"-rings. External leaks may not be evident; however, the leak may prevent the engine from achieving a partial crankcase vacuum.
5. Check the breather for damage, dirty condition, or improper installation. The oil return hole(s) must face down.
6. Check the engine compression using a compression tester. If the engine has weak compression, determine the cause of weak compression: worn rings, leaking head gasket, or leaking valves. Follow the compression tester's procedure.

Let me know about the oil and if the manual helps.
Eric