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the swirl port thing sort of worries me..it looks like they take up a lot of room, and the serious heads dont have them.




Are you talking about the rotator on the exaust valve? If you are it will cause problems even with a small performance cam.... I have a head with a hole in it to prove it. One of my valves broke at the retainer (from coil bind?)fell down in the cyl. bent the rod n punched a stem sized hole in the head.