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The early 928's used halfmoon shaped woodruf keys to align the cam gear. This created a weak point where there is about 1/16" of metal between the key cutout and the bolt hole. This wasn't a problem until the oil industry came out with low zinc oils which increased the resistance at the cam lobes. Since the drivers side cam gets the initial torque on start up, they normally crack first (like mine). You may want to pull the gear on your drivers side and check it for cracking. Also make sure you are using high zinc oils.
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Dennis
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