Wanted to update this thread to include what I found out to be the issue. It was never the valve train. Since it only made the noise under light load I didn't want to risk a $7k long block with a no belt drive. Even though it prob wouldn't hurt anything. The problem was and still is inside the damn Vortech. The impeller gears are worn just enough to let it rattle with belt vibration. 4v Vortech guys, check out the head unit first. I've been reading that ALOT of the V2s rattle or have "gear chatter".