a winding or fluttering noise coming from the engine?

whenever i start to accelerate i hear this fluttering type noise coming from the engine on the left side and its a very dry sound, any clues as to what it is, i've checked all my fluids and stuff, idk what it could be. I drive a 97 Z28 camaro, 5.7L 350 V8, aluminum small block, has 135K miles on it. everything else looks fine, and i've noticed a lack in performance lately too...
 
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