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Are the heads torqued down or loose when you're experiencing the binding? Did you try swapping with the other cam tower (assuming that one didn't bind) onto the offending cylinders? This will tell you if the problem is a cam tower issue or not... perhaps then head fly cut unevenly, jug height difference or spigot surface height difference.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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