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To minimize the fouling on the valves, Jerry had them polished. They were chucked into the output shaft of a 1,700-rpm electric motor and given a mirror finish.
Reworking The 4.6 Two-Valve Cylinder Heads

 To minimize the fouling on the valves, Jerry had them polished. They were chucked into the output shaft of a 1,700-rpm electric motor and given a mirror finish.  View Related Article

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