Comp Cams 3114CPG Hi-Tech Roller Race Timing Set for GM LS Gen IIIHi Tech 9 Key 1 Row Timing Set 3 Bolt LS An excellent performance upgrade, this 1 Pole single roller timing set for GM LS 3 Bolt engines is adjustable in 2 degree increments up to 8 degrees total advance or retard. Ideal for street cars and clears factory front cover. UPC 036584389750 Manufacturer COMP Cams Emissions Code Make GM Keyway Adjustable Yes