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Racing Valve Seats Unported Heads

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Many classes call for unported heads, so you could be starting with a production casting (shown) or an aftermarket equivalent. The only avenue open to modification is the valve seats, and how they are cut can be a deciding factor in overall engine performance.
Valve Seat Power

 Many classes call for unported heads, so you could be starting with a production casting (shown) or an aftermarket equivalent. The only avenue open to modification is the valve seats, and how they are cut can be a deciding factor in overall engine performance.  View Related Article

 

 

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