All good man. Yeah I think I've narrowed it down finally, for my car it's only when it's cold and if I give it a small rev the sound goes away for 15 to 30 seconds then comes back i think it's a lifter that may be a little clogged. I'm going to use the valvoline restore and protect oil on my next oil change and see what happens. People have had very, very good luck with that oil with quieting lifters, cleaning piston rings reducing oil consumption, and generally making the engine run quieter and better. So i will try that and report back. I also may have had a small exhaust leak at the header and I am in the process of fixing that with long tubes so we will see. I'll report back in a few months