However, a good approximation can be made. To convert liters to cubic inches, you use the conversion factor: 1 liter ≈ 61.0237 cubic inches.
Therefore, a 6.1L engine is approximately:
6.1 liters * 61.0237 cubic inches/liter ≈ 372 cubic inches
Keep in mind this is an approximation. The actual cubic inch displacement of a specific 6.1L Ford engine might be slightly higher or lower.