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The exhaust-side cutaway also revealed a couple of problems. The water jacket and valve pocket have thin walls (A), and the valve-guide boss (B) protrudes into the port. Careful contouring of the valve-guide boss will be a big help here.
Reworking The 4.6 Two-Valve Cylinder Heads

 The exhaust-side cutaway also revealed a couple of problems. The water jacket and valve pocket have thin walls (A), and the valve-guide boss (B) protrudes into the port. Careful contouring of the valve-guide boss will be a big help here.  View Related Article

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