Many street owners don't realize that according to the SVO catalogue pages, C302(B) SVO high-port cylinder heads were purposely made with thick port walls so custom porting could be more easily done. Thus many of these heads owned by racers now have different port sizes. The upside was if you have a set of unported C302(B) heads, air/fuel velocity tends to be higher and they sometimes deliver better low-end torque but fall off earlier than- for instance, the big-port SVO A-3s.
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