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Be aware that if you mill the head on an overhead cam engine, the cam timing (and ignition timing if it's driven off the cam) will become quite retarded, because the cam to crank distance will be reduced while the belt is staying the same. This could be beneficial if you want to go for a poor man's Atkinson, but I would modify the cam sprocket to be sure the cam timing remains the same. That way you can test the effects of increased CR alone and then adjust the cam timing if you want later.
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