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The cutaway of the intake port revealed two potential problem areas, if the porting gets too aggressive. The long side of the valve pocket (A) is very close to the water jacket, and the hump in the port (B) is close to the bottom of the lifter bore.
Reworking The 4.6 Two-Valve Cylinder Heads

 The cutaway of the intake port revealed two potential problem areas, if the porting gets too aggressive. The long side of the valve pocket (A) is very close to the water jacket, and the hump in the port (B) is close to the bottom of the lifter bore.  View Related Article

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