Well, look what we have here!

yellow rose said
BTW, have you EVER measured blow by on a running, loaded engine? Of course not. It's a damn good indication of ring seal. It's called testing.

Gapless tops seal fine under load as do ALL rings--its under high vacuum decel that they lose their ability to seal. Doubtful you can comprehend what I just wrote. You should just get out there and drive your masterpiece and see for yourself. J.Rob