Quote:
Originally Posted by Dan
These are usually the cover that sit over each valve cover or the entire top of the engine and primarily are just to muffle valve train noise so people aren't bring their cars in complaining of the ticking. The LS series engines do have a bit of a noisy valve train. When you look at the engine bay pictures of the new v6 Camaro, that entire black and silver piece on top is the engine cover.
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tho the LS valvetrains can be slightly tapping, a lot of the noise comes from piston slap with those motors.