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Jerry removed the vane and blended the area around the intake valve into the roof of the combustion chamber. This increased the volume of the combustion chamber to 55 cc which dropped the compression ratio to 8.77:1. The super-trick thing to do would be to weld up the chamber around the spark plug boss into a wedge shape.
Reworking The 4.6 Two-Valve Cylinder Heads

 Jerry removed the vane and blended the area around the intake valve into the roof of the combustion chamber. This increased the volume of the combustion chamber to 55 cc which dropped the compression ratio to 8.77:1. The super-trick thing to do would be to weld up the chamber around the spark plug boss into a wedge shape.  View Related Article

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