Has anyone ported stock magnum heads and have the before and after flow numbers .???

Brooks James said

I've read that stock magnum heads will do 210 CFM, at what rpm I don't know ?

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Contact Utawsome Performance. Marty, the owner has been working on these motors since they came out in 1992. He's a good guy & very knowledgeable about these engines. He'll have the answers you're looking for.