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Larger 1.74-inch and 1.50-inch Chevrolet valves improve breathing and boost torque. This easy upgrade can be accomplished during a valve job.
Building Up A Vintage Ford Six-Cylinder Engine

 Larger 1.74-inch and 1.50-inch Chevrolet valves improve breathing and boost torque. This easy upgrade can be accomplished during a valve job.  View Related Article

 

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