Cubic inch displacement (CID) formula:

Bore divided by two- - - - -60 over would be 3.810"- - - -half of that is 1.905
Bore radius squared- - - -1.905 X 1.905 = 3.629
3.629 X Pi (3.14) = 11.395 multiplied by the stroke (3.9375) = 44.87 cubic inches- - - -displacement of one cylinder.

44.87 X 6 = 269.21 cubic inches.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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