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If your cam needs to be advanced or retarded, either to account for machining tolerances or to change your engine's powerband, you'll need a multi-keyway crank gear in your timing chain set. Unbolt the cam gear from the nose of the cam and remove the cam gear and chain from the engine. Then slide the crank gear off of the crank snout and reposition the crank gear as required. Rotate the crank to position the crank and cam gear index marks, and reinstall the chain and cam gear.