[TheBrightSide]

Originally Posted by morepowerjoe

I'm guessing that you've never seen the bottom of your valley cover correct? The reason I know this is because you should have a pcv system under it.
https://www.carparts.com/details/Che...ll%20-%20Parts

https://www.jegs.com/i/Chevrolet-Per...99296/10002/-1

I completely forgot. I was reading about another person's LS3 in this thread: https://www.camaro5.com/forums/showt...=324052&page=7

Looks like the LS3's valley covers do use that internal-styled oil catch can that they designed. Since my blow-by issue didn't change even with adding an in-line PCV valve, but only changed after running an engine treatment formula in the engine itself; I can only assume that the piston rings were stuck.