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I have a 2007 Pontiac G5 GT has recently started lightly tapping on top end in the middle of the block I personally think it's the lifters I cannot find any information about how to replace them are things I need to replace while taking it apart can anyone give me any information on them
 

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I'm no 'certified' mechanic, but I would pop off the valve cover (have a new gasket ready) and see if there's a gap between the cam and valve at any point, while turning the engine with a wrench. When I replaced my injectors, the new ones were DEAD silent, so, maybe them? Use a rubber tube to stethoscope exactly where the tapping is from.

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