Rick,
You were exactly right. There was a 1" gap missing from the front passenger side gasket. Replaced with some better gaskets on both sides and torqued the bolts to spec. I'm sure it was one of those things I forgot re-check before working on the final tune.
I also changed the
oil and filters (strained them through a paper towel to check for any shavings or specks), checked the rollers for any play and buttoned her up and gave her fire. No more noise.
Thanks for your help.
Duff