Hello all, first post here. I’ve built plenty of Chevy motors before but this is my first time wrenching on a Vortec 5.7. My 1998 Tahoe 2 door leaks all over the place with 195k miles on it so I figured I would tear off the intake manifold and timing cover to fix some of the leaks, upgrade to MPFI, and replace some other stuff. To my surprise the passenger bank valvetrain is a yellowish color and the drivers bank is more of a reddish color. As far as I know the valvetrain has never been touched and if you look at the passenger pushrods the bottom portion of them in the valley is the same color on both sides. Any ideas what would cause this? Thank all.