[Healeys] The AEC960 Healey 3000 Cylinder Head spark plug seat and timing issue

[Oudesluys]

  Chris,
The plug concerned seems to be fitted more upright that the other two. 
If you machine the recess on the outside and the plug would sit deeper 
may be the plug can be hit by the piston?
Perhaps it may be better to remove some material and shape the area 
around the plug nose in a smooth cone.
Ok, you will loose some compression but gain in flame front.
Kees Oudesluijs
NL

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