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Blending is allowed 3/4 of an inch into the ports measured from the top of the valve seats. Good work here can make a big difference in an engine’s performance—this is where Yates earns his keep.
Project Mudslinger: Shoehorn, Please!

 Blending is allowed 3/4 of an inch into the ports measured from the top of the valve seats. Good work here can make a big difference in an engine’s performance—this is where Yates earns his keep.  View Related Article

 

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