[360]

Based upon your commentary, the autopsy revealed a breach in the head gasket? Any surface irregularities on the metal surfaces?

No irregularities that I can see and it will now make air up to the cut off limit.  I didn't time it the other day, but I want to say I'm pretty close to 5 minutes of run time from cut in to cut out.  That was from a previous timing recently.  

On the diagram of my layout here my sketch and a photo as well.  

I will attempt to blow into the the line with compressor off to see if unloader has failed.