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The carbon buildup around the intake port is due to the intake-runner design inside the Vortec head and doesn't necessarily mean that the combustion chamber is inefficient. Don't worry about porting the spark-plug boss out of the chamber.
Impersonator II

 The carbon buildup around the intake port is due to the intake-runner design inside the Vortec head and doesn't necessarily mean that the combustion chamber is inefficient. Don't worry about porting the spark-plug boss out of the chamber.  View Related Article

 

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