Any of you guys ever heard of Pie R squared?

Volume of a cylinder is Area x height.

Area of a circle is as follows:

Area = Radius squared x pie

Radius x Radius x 3.14 = area

Radius is 1/2 diameter.

If you had a 3.25" bore and a 5" stroke:

Radius = 1.625

1.625 x 1.625 = 2.640625

Now take that and multiply it by 3.14

2.640625 x 3.14 = 8.294916 <<<<<<<thats the area of the piston

Now multiply that by the stroke:

8.294916 x 5 = 41.47 cubic inches

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350 Chevy

3.5 bore

1.75 x 1.75 = 3.0625

3.0625 x 3.14 = 9.61625 <<<<<area of the piston

9.61625 x 4 = 38.465

38.465 x 8 cylinders = 307.72

Your 350 doesn't have a 4" stroke. In fact, it has a 4" bore and a 3.5" stroke

Let's do the math on that

2 x 2 = 4

4 x 3.14 = 12.56

12.56 x 3.5 = 43.96 cubic inches per cylinder

43.96 x 8 = 351.68

You go the same number as me, but you skipped the step about radius squared. It just happens that 1/2 the diameter of the 4" bore is 2 and when you take 2 (radius) x 2 you end up with 4 again. [:-] The rest of your math is correct.

But, it's still only a 3.5" stroke. 4" bore.