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You have to take into consideration the stock head is what I would refer too as "big & lazy". The intake runners are ( old man and pray can correct me) somewhere around 298cc's. Yet it flows just a few over 300 c.f. stock. They make power stock but that's not a good coefficient. Power for the most part comes from air speed (velocity). So the most air flowing through the smallest hole typically makes more HP and wins races. An example would be a TFS 235. This particular head flows close to 350 cfm, has a 2.08" intake valve, yet does it with a 235cc port. A better coefficient and more condusive to making power. So my theory on these heads are you're better off with a race valve job as opposed to having them hogged all out, killing your low end power. That's why I can understand they're showing to make excellent power with strokers. Our stock 6.2L are not taxing these heads at all. Its a great head. Just lazy. That's why I strongly believe the new Victor Jr's will be a game changer. In thinking around 360 cfm from a 285cc port..
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