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A finished combustion chamber and valve pockets. Notice how close the valves are to the edges of the combustion chamber. You couldn’t install larger valves even if you wanted to.
Reworking The 4.6 Two-Valve Cylinder Heads

 A finished combustion chamber and valve pockets. Notice how close the valves are to the edges of the combustion chamber. You couldn’t install larger valves even if you wanted to.  View Related Article

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