Gapless rings were invented to go in dirt track engines so after 3 races they would still have some compression and put off the re-build by a couple weeks--They make a leak down test look Perfect! That part of the advertisement is 100% true--On the dyno they will not make 1 mor HP in the engines I have done--I used to do the circle track 345-360 HP two barrel limited engines Gapless rings were tested again and again--they NEVER made one more HP They leak checked like amazing though

Have true round no taper cylinder bores by using a TQ plate and many other details --use the cheapest rings on the planet and you will have good ring seal use good rings and it can be less resistance and more HP

I do use gapless second rings in my alky / nitro dragster engine because they do keep oil contamination on that fuel eater ( runs gallons through in seconds) to a minimum but they DO NOT make more power or are any better than conventional ring packs on a drag engine for any other reason

This is from observation not reading about it