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Project Ford Focus Svt Pistons

One of the most apparent differences between the stock piston (right) and the JE piston (left) is that the JE piston has a dish in it to reduce the compression ratio to a more turbo-friendly 9.0:1.
Project Ford Focus SVT

 One of the most apparent differences between the stock piston (right) and the JE piston (left) is that the JE piston has a dish in it to reduce the compression ratio to a more turbo-friendly 9.0:1.  View Related Article

 

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