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"but stacking the cylinders to restore deck height, and shaving the chain boxes to match any "left-over" height not restored by the stack will return the squish area, thus CR to before resize numbers."
Donnie,
Spacing the cylinders to restore deck height is one operation.
Shaving the chain boxes compensates for the new stack height, net material added/removed from cylinder head, cylinders and crankcase. This is a result of but independent from CR changes.
"Returning to the previous compression ratio."
If the machining operations reduce the volume of the combustion chamber and/or cylinder, the CR will change. The compression ratio is the ratio between the cylinder+combustion chamber volume at BDC and the volume remaining at TDC..
Hope this helps,
Sherwood
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