How To Build Your First Engine
To degree the cam using the intake centerline method, begin by rotating the engine clockwise until the dial indicator reads about 0.025-inch before maximum camshaft lobe lift. Record this location on the degree wheel (83 degrees, for example--arrow A). Continue rotating the engine in the same direction past maximum lobe lift until the pointer is at the original checkpoint. Mark the degree wheel (140.5 degrees--arrow B). Add the two readings, and divide by two. The result is the intake centerline (111.75 degrees--arrow C). If, according to the camshaft specifications card the intake centerline for the cam is supposed to be 109 degrees, then you must advance the cam 3 degrees. If checking the cam using the 0.050-inch opening-and-closing-points method, rotate the engine clockwise until reaching the 0.050-inch check points, compare the numbers observed on the degree wheel at the proper check points to the numbers listed on the timing card, write down the difference in terms of degrees advanced (early) or retarded (late), and average the results to determine if the cam needs to be advanced or retarded. View Related Article
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