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The valve pockets were blended into the valve seat with a rotary file. Jerry didn’t drastically reshape the pockets and ports; he blended them so the air would flow smoothly.
Reworking The 4.6 Two-Valve Cylinder Heads

 The valve pockets were blended into the valve seat with a rotary file. Jerry didn’t drastically reshape the pockets and ports; he blended them so the air would flow smoothly.  View Related Article

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