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In recent years (and after much research and development), the clover-shaped combustion chamber has proven itself superior to the heart-shaped, fast burn, closed and open chamber of years past. The valve seats feature multi angles for additional flow at low and mid-lift. It's easy to notice the precision CNC work to the combustion chamber (69cc) and port runners. Again, notice the port's gentle turn and approach to the valve seat-this is a major advantage these taller heads provide.