Hello J. I took the intake manifold off as you suggested. I also took the valve cover off. The six stud bolts I refered to are the intake manifold to HEAD (I mistakenly typed block other post) mounting studs. The threaded holes these thread into go straight into oil chamber of head and were loose and leaking. Valve stems are not visible from intake ports. Yes I am still chasing that miss and excesive smoking issue. I have previously taken the exhaust manifold off and watched which cylinders are smoking and it seems to move around and change as engine warms up. Thanks Rocko.
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