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CU IN QUESTION

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STOCK CU IN IS 182.89 WITH A COMPRESSION RATIO OF 10.5:1 AND YOU CHANGE THE COMPRESSION RATIO TO 9.1:1 WHAT WILL THAT DO TO YOU CU IN AND YOUR ALL OVER MASS AIR FLOW CF/MIN? HOW DO YOU CALCULATE THAT?

Changing the compression ratio does not change the displacement. Only modifying the Bore or Stroke dimensions will do that. Changing piston shape or head volume to change the compression ratio will not change either of those two dimensions.

If the efficiency of the engine changes, then the mass flow will change, otherwise it will be basically the same.