I've taken extensive measurements and crunched the numbers. For the stock, non SVT lower IM there are no gains by opening up the casting. The smallest/narrowest point in the casting is the bore at the shaft/plate assembly. I'm not interested (at this time) in going to larger plates, as this is the only way I figure to get an increase in flow quantity. I have been able to improve quality though. Upper is basically the same (non SVT).
Did you remove the shafts when you did your work? If so, did you re-install them?
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