Theres a noise coming from my motor that ive never heard before in any other LS1. I know its not piston slap, ive heard that many times. Its sounds like a bunch of loose bolts rattling from somewhere, but its definately coming from the engine so that cant be it. Ive been told pushrods but the thing is that when i run half a can of seafoam through the brake booster line, the sound is gone for a week or two. Then it goes right back to sounding like shit. Anyone know what this could be?