Ron,
Here's the math:
Radius Squared x Pi = Area of a circle
Radius = Bore/2
Cylinder Radius Squared x Pi x Stroke x Number of Cylinders = Displacement
or
(Cylinder Bore/2) x (Cylinder Bore/2) x Pi x Stroke x Number of Cylinders = Displacement
Radius of a 4.030" (30/1000 over) cylinder is 1/2 of the bore = 4.030/2 = 2.015"
Radius Squared = 2.015 x 2.015 = 4.060
Pi = 3.14159
4.060 x 3.14159 x 3.70 x 8 = 377.5 cubic inches.
4.060 x 3.14159 x 3.75 x 8 = 382.6 cubic inches
4.060 x 3.14159 x 3.85 x 8 = 392.8 cubic inches
4.060 x 3.14159 x 4.00 x 8 = 408.1 cubic inches
cowboy from hell
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