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A machined valve job should be the start of every porting job. These Mopar Large Port Commando heads were given a full competition valve job, including the chamber sweep, and 75-degree throat cut before porting began.
Port Any Head -- Technical Article -- Engine Masters

 A machined valve job should be the start of every porting job. These Mopar Large Port Commando heads were given a full competition valve job, including the chamber sweep, and 75-degree throat cut before porting began.  View Related Article

 

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