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This shot illustrates the three different cam sprockets available for the LS family. The LS3 (bottom left) featured provisions for the front-mounted cam sensor and a single retaining bolt. The LS1 (bottom right) featured three retaining bolts but no provisions for the front-mounted cam sensor. The top sprocket required for installation of the three-bolt cam into the LS3 (GM PN 12586481) featured the three-bolt retaining pattern and the provisions for the cam sensor.