Thanks for your reply. So you were there during the production run. Iwould like to see your reports.They would make interesting reading.I had nt thought of the stethoscope so that is worth a try. There was no blank vin tag from memory holding any seals in place so i can eliminate that i think. The foam rope in the door seal is worth a try if i can pin in down to that spot. My hearing is less than average which makes it more of a challenge to pin it down. I think the noise is coming from A, B or C.?? I used dynamat to quieten the interior right down as the 347 is not the quietest power plant to have. It worked well as the only noise is the whistling wind.
Your corner fix with kids clay could be the go too so i will try all your suggestions.
Thanks for your help here.