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Normal Bore is 4.0, Stroke is 3.98. 30 over bore is 4.030. Radius of new bore is 2.015

Volume of 1 Cylinder is ((2.015*2.015)*3.14)*3.98 or 50.74 per Cylinder

6 Cylinders so new displacement is 304.45 CI

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Q: Your ford 300 straight six is bored 30 over what cubic inch would this engine be?
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