RE: Oil leaking all over the inside cowling
I think I answered my own question. The header O-ring I was using did not fit properly and was an aftermarket type. Ditto for the Viton O-ring, it may have been from a bad batch. I still had a brand new Hatori O-ring and it fits much tighter. I have not flown it yet as the highs of mid 30s F lately here are not appealing for me doing that.