S/R Timing Chain Set With Torrington Bearing ROCS1135S R Timing Chain Set With Torrington BearingSuit LS1 & LS6 ROCS1135 CS1135 All Timing Chain Sets are made from billet steel, have 9 Keyways (unless otherwise stated) and have a heat treated crank sprocket. Red Series: standard billet steel set 9 Keyway Gold Series: premium billet steel set with all sprockets nitrided by better durability and longer life. 9 Keyway Blue Series: economy sets for quality but with a budget, Line Bore Kits available in .