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There are some areas I have pointed out here that are darker from the exhaust that create a ridge and narrow the opening. Not by much but easily 1/8" to almost 1/4" in some areas and the entire circumference of the port.
This is a ridge that seems to impede flow and bottle neck the exhaust right where it comes out of the cylinder head. Just an eyeball guesstimate I believe it could be easily between a 5 and 15 percent blockage.
I'm removing this blockage as best I can and also getting inside and trying to open it up just a little and straighten some of the curves.
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