481 cubic inches.
It's 3.14 X radius (2.155) squared = 14.582
This is the area of the circle. To get the volume of the cylinder, you take that number and muliply it by the stroke (4.125). This gives you 60.152. This is how many cubic inches each cylinder is. Then just multiply by the number of cylinders in your engine (8).
And you get the magic number 481.214 cubic inches. That's a big engine. Hope it helps.
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