Cubic Inch (cu in) = Liters (L) × 61.024
Given that the engine size is 6.6 liters:
Cubic Inch (cu in) = 6.6 L × 61.024
Cubic Inch (cu in) ≈ 402.58 Cubic Inches
Therefore, the 6.6 liter engine has a cubic inch size of approximately 402.58 cubic inches.