I`ve got some serious upper valvetrain noise with a dead miss on both left and right banks. Haven`t pulled the covers yet just too see whats up but I`m thinkin camshaft! So far I`ve done a spark check with it running and I haven`t found a bad plug or faulty wire. I`ve done cams before but I am not sure what I`m getting into with this animal. Any tips or tricks would be greatly appreciated!!