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A lot of the aftermarket cams need to have the head clearanced for the bigger cams. They remove metal somwhere for fitment. 5-angle valve grind with oversized valves would help breathing. Search KA valves on google and you'll find what I'm talking about. If you are the one port and polishing make sure to flow bench the head. If you don't know what you're doing you can remove to much and have ill-effects or have unequal flows between ports/cylinders.
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