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I’ve tried several tactics at attacking my lifters in my 03′ Avalanche. It has a 5.3L V8 that has had this tapping for a few years now. Just haven’t really thoght about it because the truck runs great. Shes purrs like a kitten beyond the lifter/valve tap in the engine. I’ve tried seafoam many times for the past couple weeks. Also tried Marvel Mystery Oil. Did a motor flush. I think they’re either extremly cruddy or broken. I was wondering how much does a mechanic shop charge for the job on average. I understand you can’t tell until you get working but just an estimate.
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