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No you don't add the values. Flow bench numbers don't mean everything, but they are some sort of reference I guess. Numbers from different flow benchs aren't going to compare perfectly either. But, don't expect good numbers from the MKIV turbo head just becuase it is an almightly Supra and they can make shitloads of power with their 3 liters and 35psi of boost, it is not considered a good head design. DSM heads are better and Honda VTEC heads are very good.
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