So I've verified EQ is almost dead on with an external wideband about probably 30 times, I spent 100s of logs tuning VVE on this motor which is a lot more difficult since you have to convert the algebraic coefficients into a meaningful VE value. I though that much carbon buildup was normal?

Here are some pictures of when I first put my heads and cam on back when the motor was still stock at about 80k:



I don't notice much of a difference except my intake port looks a little cleaner now since I only run it with E85, but PCV still circulates oil on the back of the intake valve that ends up coking it up.

 

Yeah, I am thinking its going to be about a grand to remove the old seats and put all new oversized ones in. Anyone have any recommendations on seats?