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If you check the specs from Comp Cam you see that the lift and duration are the same for the intake & the exhaust. With modern CNC technology there would be no problem grinding them differently if there was an advantage to do so which leads me to conclude there would be no advantage to just changing the intake rocker. although considering the ease of changing them I personally would try just the intakes first and document the results before changing the exhaust rockers. Perhaps if fuel economy is the main goal, not increasing low end power which is Comp Cam's goal, this approach might show some gains.
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