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Head Porting Valve Seat Forms

 
Head Porting Valve Seat Forms
Head Porting Valve Seat Forms
FIG.2-With its sharp edge, A has the worst efficiency of this group. The single-cut 45-degree seat (B) is smaller under the valve but flows much better. With a three-angle cut (C) the seat area is better yet, and a forth cut (D) at the bottom (blue) can usually add a little more. View Related Article
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