here's one from a quick search:
Here is something I have posted before so it's easier to just copy it
I do not use or recommend gapless rings at all any more.
As for the Total Seal ones, every engine I have ever taken apart that had them had at least one & usually more of the gaps lined up.
Almost every performance engine builder I know advises against them.
I advise against them.
I have seen absolutely no gains except for the static leakdown numbers which don't tell you crap about what's going on under a load at RPM.
I have personally seen more crankcase pressure (blowby) at higher RPM's in the same basic engines with the 2nd gapless rings.
When you read magazine articles citing great gains with the newest widget try to remember who is paying for the article or the advertising in the magazine.
I use 004-.0045 top & ..005-.0055 second gaps on most performance engines except for KB's which I use very rarely.
Even the OEM's are going to larger 2nd ring end gaps & most major ring manufacturers are recommending a wider gap also.
Just a few of my thoughts on crapless 2nd rings 
I have not used the top gapless rings so I can't comment except to say that at temperature you have almost no gap with standard rings.
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Mike (Wolfplace)
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