I just replaced my cam a couple months ago. Did it with the engine in the car, never touched the oil pan bolts for any reason. The cover will come off by prying it slightly at the top and can be reinstalled by placing a screwdriver in one of the upper holes and pressing the cover down and into the oil pan seal. It takes a bit of effort, but a whole lot less than pulling the engine! By the way, I have no oil leaks whatsoever after the job.
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