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0302MM Interchange121zoom

Earlier heads have an open chamber and heavily shrouded intake valve. The cast piece near the intake valve is called a "swirl fin" and is designed to help the mixture swirl as it enters the cylinder.
Modular Mix & Match, Part 1

 Earlier heads have an open chamber and heavily shrouded intake valve. The cast piece near the intake valve is called a "swirl fin" and is designed to help the mixture swirl as it enters the cylinder.  View Related Article

 

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