There's no single answer to "how many cubic inches is a V10 engine." V10 engines come in many different sizes from different manufacturers. The cubic inch displacement varies significantly depending on the bore, stroke, and number of cylinders (which is fixed at 10 in this case, but the dimensions of those cylinders change).
To find the cubic inches of a *specific* V10 engine, you need to know the engine's displacement, often listed in liters or cubic centimeters (cc). You can then convert that to cubic inches.
