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Though the entrances of the ports are stock height, the intake ports do feature a raised floor for better performance yet they maintain a 180cc volume like the factory heads. They do however, have lots of material in the walls and roof for porting.
KRE's New Aluminum Pontiac Head Exposed

 Though the entrances of the ports are stock height, the intake ports do feature a raised floor for better performance yet they maintain a 180cc volume like the factory heads. They do however, have lots of material in the walls and roof for porting.  View Related Article

 

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