Good question. And a much better question to ask my cylinder head guy. What he told me, is that they took their best NHRA pro stock stuff, and shrunk it down to fit inside a 4.250 bore (instead or 4.625 or so). The finish chanber ends up around 48 or 50 cc's. The chamber looks a lot like the canted port/canted valve sc1's. In fact, the head looks like a skinny pro stock head.
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