Dinobyte Before this motor is pulled apart, How much pressure is in the motor?? I have only a PVC valve on my motor, no breathers, and turn 6k rpm without blowing
oil out any seal. The rope seal for the crank leaks about the size of a quarter after a hard run. If you ran a mobil 1
oil for breakin in I could see a problem. If the cylinder walls have the wrong honing stone used with the wrong grit number maybe but a leak down test should be done first both wet and dry. It is possible you have the wrong PVC valve for the motor also. One doesn't fit all or it could have been boxed wrong.
You need to do the basics done before a motor rebuild. A leak down may tell you if the rings are not installed right with the end gaps lined up or the wrong end clearance. Start at the top of this list before a motor pull. Rick L