Could not find an answer to this with search....
During a track session, my crankcase develops enough pressure to pop the dipstick about 4 inches out. It mists a little oil on the bottom of the engine cover (annoys me).
It started doing this immediately after I installed the block-off plates for the big vent tube on the front of the engine. I am not running catch cans, also no intercooler. I have read all the discussion about that tube and TurboPhil's assertion seems to make sense. The whole timing chain area is open...etc.. so it's not needed. It does seem like a big coincidence if my car developed enough blow-by to start doing this exactly when I made the change.
Guess I could re-install that tube, but the bottom is a real pain. It pretty much requires removing the SC. Car just turned 30K and gets tracked pretty often, but runs great and has had mega-maintenance. No oil leaks or problems with the rest of the engine.
Any similar experience? Something to worry about? Easy fix?