No need to try to scope up thru the header pipes. Harbor Freight sells 2 different bore scopes, one of which has a head small enough to fit thru a spark plug hole, and I have one. Wish to hell I had thought of it a couple Saturdays ago when Tony was down here at my shop, gemerously using his precious time trying to help me get BGII ready for SIM by getting the trans back in with a rebuild on the hyd. TO brg, which unfortunately, promptly blew out fluid and I still didn't make it. Had I thought of it, I would have asked him to take the borescope with him to use it. And Tony, if you want it, by God I'll bring it to you, just say the word and give me the street addy so's I can put it in the "Bitch inna box". When using a borescope in a comb. chamber, if the rings in that cylinder are allowing excess oil by and into the comb. chamber, all that oil will wash the carbon off around the edges and it will be mostly on the center of the piston. As much oil as is going thru that engine, if it's getting past the rings it should be easy to spot.