Formula to determine cubic inches -

bore x bore x stroke x 2 x .786 = eng displacement

Example of 235 engine -
3.5625 x 3.5625 x 3.94 x 6 x .786 = (235.81951 ci)

Example of a .060 over 235ci engine -
3.6225 x 3.6225 x 3.94 x6x .786 = 243.82979

You can confirm the bore from the oversized piston box. Plug that into the formula above and finish.

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