I am with Vteckidd in not understanding what a valve guides, the back cut of the valves, and the valve throat have to do with oiling properties and how they attribute to anything having to do with my motor and the failure that I experienced. Hell, I never understood why the comment was made in the first place as it has NOTHING to do with my build other than the fact that I had an ITR oil pump in my car. Please enlighten us.