Number 7 looks like it was having trouble burning the strap clean. I don’t see much for evidence the issue is confined to one plenum necessarily, but 3 of the 4 plugs on the lower plenum have extra deposits on them. I think maybe Steve had the upper and lower plenums and cylinders backwards (or I do)? Number 1 was second worst for deposits, showing up more toward the threads though, instead of the strap.
I would look carefully on the number 7 port and look for either a bolt not sealed that has oil access into the port, or a spot of porosity were you ground at the pushrod pinch. My best guess is the smoke issue is connected too the recent work on the heads or from reinstalling them, and having some oil sucked past a bolt that isn’t blind. (What Skip said). Maybe inspect the port with the intake off will tell more of a story.
Last edited by Jay S; 05-08-2023 at 09:04 AM.
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