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The combustion chamber and valve pockets were finished with a cartridge roll. He left the spark plug in place to prevent damaging its boss if he slipped with the grinder. He exercised great care to keep from nicking the valve seats.
Reworking The 4.6 Two-Valve Cylinder Heads

 The combustion chamber and valve pockets were finished with a cartridge roll. He left the spark plug in place to prevent damaging its boss if he slipped with the grinder. He exercised great care to keep from nicking the valve seats.  View Related Article

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