Leak Down Test On My New 418 Need Help?

I am a firm beleaver that break-in should be done standing on the gas pedal just as hard as you can.......it takes pressure on the back side of the rings to seat them. Long drawn out engine break-ins are things of 30's, 40's and 50's due to materials engineering and machining. Things are better now for the most part, no need to draw the procedure out over time.

Something to think about after you do some sort of autopsy to find out what happened would be to put in a crankcase evacuation system, might help ring seal.