If someone would send me a 12.6 degree head I would be glad to look it over and provide some real measurements on comparison with the 11 degree here. I will return it quickly on my dime no problem.
Calvin,
What did you hit on your head? Spring pocket?? Area between spring pocket and rocker boss? Water?
Don,
Did you hit anything when you were porting?
At this point I have only rubbed up against the head bolt..no air or water.
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