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Speed Pro, Federal Mogul, Hastings, JE and a bunch of other choices out there I don't reccomend or use gapless rings anymore That was a trick of the week years ago, Total Seal does not recommend using them on a serious drag race motor anymore either I like to use a standard tension oil ring on any of my motors that won't have a vacume pump, street or strip only I also set the ring end gap a tiny bit larger than most, .0045 + on the top rings and .0055 + on the second ring per inch of bore size, .030 minumum on the oil ring gaps

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I agree about not goin the gapless route and to free up power on my last freshen, I went w/back cut top n 2nd rings w/the napier second and med tension oil rings.