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The Sunnen mahcines will produce a bore with straightness and roundness beyond what is required for even the highest performing engines. As you mentioned the stone selection and number is probably the biggest variable that plays into cross hatching and ring seal on break in. Those still have to be selected by a skilled operator regardless of the machine. The CNC machines may take a little guess work out of it but they are still far from fool proof. I would not second guess using a machine shop with a good track record and old school equipment
 
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