Calling All Spark Plug Experts, Opinions on these pics.

Fred...you've got it spot on and reminds me of: Been there done that
back at my old Suburban forum...this has been hashed outand
these links to the most germane to this thread here...

2004, 8.1L (long)


Too bad the links of this one no longer works for me...as it shows the exposed valley
and the solution was a sheetmetal cover over the valley
Pics of 8.1L internals

oil leak

Don's 8.1L has a tiny leak in the manifold system somewhere