Running a 87 FXRS with Screaming Eagle Heads. Was having problems with oil in air filter. Upon inspection noticed prior owner removed the head breather tube and replaced it with solid bolts. Had crank vented into back of air cleaner. Is this acceptable, or is there going to be to much pressure in the motor ? I think I have the right part on hand, are the head vent holes all standard on Evos or are there different sizes?