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The bore and stroke of a 427 is 4.25 x 3.76.

The formula for the area of a cylinder is pi times the radius squared times the stroke of the crank times the number of cylinders.

So, 4.25/2=2.125*2.125*3.14159*3.76*8=427.

If the cylinders are bored .030" oversize, then: 4.28/2=2.14*2.14*3.14159*3.76*8=433

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Q: What is a Chevy 427 engine bored 30 over called?
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