I did. Ive been chasing down lots of leaks over the past yr, Pretty sure I got them all now. This valve cover center bolt was the last that I found. I hope that solves oil getting into the plug tube. I beat the brakes off this motor last summer to make sure the internals were good LOL. If something was loose in there, it would have let go by now. It was stupid chit that was loose.I'd be concerned with what else might come loose if it was just rebuilt. Didn't you just put a vortech on it too? I'd go around and re-tighten everything on it.