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You would be looking to advance the intake and retard the exhaust. Running both at +4 would negate the gains of the one with the losses of the other. When we were doing some work on a motorcycle engine for another application, we pulled a significant amount of overlap out of the engine. Stock was 110 degrees crank. I believe we removed 24 degrees total. Take your +4 on the exhaust and go -4 and tell us how it goes.
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