I am almost betting on valve contact with the piston or cylinder wall. With the 1.6 rockers and the high lift cam you are cutting things REAL close.
I am trying to remember if the top edge of the cylinder has to be notched with the big valve/cam-lift and long-rockers


There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!