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More for Less Racer
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Quick and dirty formula for 8 cylinder engines only -- Bore X Bore X Stroke X 6.2832 = cubic inches.

I think stock bore and stroke are 4.44" X 4.0" but could be 4.310" X 4.25"

Stock 8,1L-- 4.44 X 4.44 X 4.0 X 6.2834 = 495.457 (496)

.030" overbore -- 4.47 X 4.47 X 4.0 X 6.2832 = 502.17 (502)

The formula is correct but I may be wrong on how GM makes the 496 (bore and stroke, there are two ways to do it)

The .030" overbore will add 6 cubic inches either way.
 
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