I just spoke to Total Seal about rings for my 434 build, pump gas street/strip deal, probably 11.3-5 to 1 compression, solid roller 260-270 @ .050, low .700 lift with Indy 360-1s. For this combination they recommended a gapless top, napier second and standard tension oil ring, 1.5mm, 1.5mm, 3.0mm.