liters measures volume. i think 1 milliliter is 1 cubic centimeter, there are 2.54 cm per inch so
so there is (2.54x2.54x2.54) = 16.4 mL per cubic inch, invert that and multiply by 1000 to get 61 cubic inches per Liter.
to test this a 302 cub. inch engine divided 61 cubic inches per liter = 4.95 Liters approximately 5.0.
a 200 would be 200/61 = 3.3 L
i think this is right.