Lunati Adjustable Timing Sets offer an adjustable cam gear in the range of a 6-degree advance/retard plus 3-keyway crank sprocket for an additional 4-degree incremental adjustment... that's a maximum advance/retard of 10 degrees! Large-pin double roller chains are prestretched and heat-treated for durability, and the induction hardened steel billet gears are among the longest lasting on the market. Low-friction Torrington roller thrust bearings make these timing sets ideal for street performance & racing.