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351 Cleveland Performance Engine Build John Douglas

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John Douglas' porting regiment includes taking stress risers and bumps out of chambers and ports. Stress risers in combustion chambers create hot spots that can cause detonation problems. This is especially important in open chambers notorious for detonation issues. John works the bowls and valve seats to smooth airflow. It looks like John has gone with a standard three-angle valve job here for the street. A five-angle valve job costs more, but it produces even more airflow.
351C Performance With Common Parts - A Cleveland Course of Action

 John Douglas' porting regiment includes taking stress risers and bumps out of chambers and ports. Stress risers in combustion chambers create hot spots that can cause detonation problems. This is especially important in open chambers notorious for detonation issues. John works the bowls and valve seats to smooth airflow. It looks like John has gone with a standard three-angle valve job here for the street. A five-angle valve job costs more, but it produces even more airflow.  View Related Article

 

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