I've built a few motors with the thin "LS" rings - no problems.
Back in the late 90's I used a set of the Total Gapless 2nd rings. They were basically an iron ring with a groove for 2nd ring (like an oil scraper ring) and you stagger the end gaps. I'm not sure if they even make those anymore, a gapless top ring makes much more sense to me. Anyway, that motor lasted maybe a year, and it was burning oil. One (maybe two, it's been a while) of the gapless rings had cracked. They also had nothing to keep the rings from rotating (maybe they've addressed that issue with their newer rings) and several of the other had rotated so that the gaps were aligned (so no longer "gapless").
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
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