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The last time I checked, there was a slight taper machined into the cylinder sealing surface. The surface closest to the bore was slightly taller than the outside edge.
If this is true, then it would promote a high clamping pressure at the most critical area of sealing. If you lap it, then it would diminish this important feature.
I noticed the taper on 3.2 cylinders, I have not checked on other cylinders that ran CE rings.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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