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You can pull the timing cover with the engine in the car, I've done it to change a cam gear. Try pulling the cam position sensor, if it's small enough you might be lucky enough to have it drop through the hole. Other than that, once oil floods into that area there's a port on the head that drains back oil and the rock will go into the head and may drain down into the pan. Not 100% sure on that though.
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The answer is racecar. Always.
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