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Now we check our cam timing by checking as the intake starts to rise and then before it returns to the base circle of the cam. We could use up a few pages just on cam timing and the theory behind it. Contacting Comp Cams and ordering their video on the procedure that walks you through the entire process is the best policy. One more thing-if you change the cam timing, recheck the connecting-rod-to-cam-lobe clearance. The cam lobes can be closer to the connecting rods when cam-timing changes are made.