That's basically what I was saying. Without a blowby meter (or something similar) you only have leak down and compression testing and the gapless top always looks good in those.

The only issue with using the blow by meter is using vaccuum pumps and dry sumps. You can't use the blow by meter with them (at least I have not found a way to do it yet) so it will skew readings and make a good ring package look bad. As with all testing you need to be very careful otherwise the numbers mean nothing.