Quote:
Originally Posted by Half-Inch Stud
~1992 i had a fresh gapless 455 build that spewed oil. Gapless rings didn't seat. Re-Builder said was my fault for not having (connected or disconnected i forget) the PCV during breakin. CYL walls were a stinking mess. Went with legacy PMG rings since and no blowby on any. Oh and i always run PCV, break-in and all.
Far as i have seen; Gapless rings are for the experienced experts.
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Considering this happened in 1992 I'm guessing thsee were a gapless second ring set. I've heard similar stories that claim due to the increased suction from the gapless ring the PCV system needed to be restricted or it would suck to much oil into the system. Not sure if that is true and not sure if the gapless second rings did much other than improve leakdown test results. I never experienced this on any of my builds using gapless rings and never restricted a PCV valve or removed it during break in.