Ring sets include cast iron compression rings and three piece flex-vent oil rings, except for early 1200cc, which is a one-piece cast iron oil ring.. Sets are for two pistons.. Late 1200cc-FL, FLH, FXE, OHV:. Hastings #6482 replacement rings for listed 74" O.E.M. applications and all Twin Power 1200cc pistons have 1/16" compression rings. Standard bore is 3.438". Fits 55-80 Big Twin. Early 1340cc Shovelhead:. Hastings #6127 replacement rings for listed O.E.M. applications and all Twin PowerT Shovelhead 1340cc pistons. Standard bore is 3.498". 3/16" oil rings, 1/16" compression rings. Fits 78-E83 FL; 79-E82 FX. Late 1340cc Evolution:. Hastings #6164 replacement rings for listed O.E.M. applications with 5/32" oil rings and all Twin Power Evolution 1340cc pistons. Standard bore is 3.498". 5/32" oil rings, 1/16" compression rings. Fits L84-99 Evolution Big Twin.
