Quote:
Originally Posted by Bored&Stroked
Now Pete . . . show us the "AFTER" view of the chambers! 
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I don't have any pics of that but just imagine a completely flat surface for flat top pistons.
The slight kickout in the chamber on one side is straightened to get maximum area available. Edelbrock heads do not have this kickout so they are a bit easier to do.
Sometimes the transfer area is welded back to the edge of the valve. This is the area that is machined to adjust the compression.