MG -  Just wondered if having the PV stuck open would wear out the piston and rings sooner due to having an full operational PV.  Like having pressure excessive pressure in the cases and detonating issues.  Just wondering.

Thanks for your help on getting me on track.  Sooner maintenance will be in my future.

  Q2W those cracks were completely through the piston walls(both sides) you saw it first hand.

One last thing I need to add....My right rear cylinder stud came loose and was causing my cylinder to move during operation.  Thankfully there was no sand in my cases.

A rebuild is now underway.