A Matter Of Timing
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Next remove the old timing chain and gear. You will also need a puller to remove the original crank gear. As the photo shows, the new crank gear will have three or more slots to line up with the crankshaft keyway. One slot will be for “straight up,” or no advance; one will offer 4 degrees of advance (slot A); and one will offer 4 degrees of timing retard (slot R). These are offered to allow you to custom-set the valve opening and closing points relative to TDC. The small eccentric cam bushings can also be used if you prefer. These bushings, available from Crane, Moroso, Mr. Gasket, and others, are often set in 1- or 2-degree increments. This does require that you drill a 0.400-inch hole in the cam gear to accommodate the larger bushing. The trick is to drill this hole from the back but not to drill all the way through. This retains the eccentric in the gear. View Related Article
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