The actual displacement of the 5.3L engine is very close to 323 cubic inches. The slight discrepancies arise from:
* Conversion factors: The conversion from liters to cubic inches isn't perfectly precise. Different rounding methods at various stages of calculation can lead to minor differences.
* Manufacturing tolerances: Engines aren't manufactured to be *exactly* 5.3 liters. There's a small tolerance range. The final displacement of an individual engine might be slightly above or below the nominal 5.3L.
* Marketing and Simplification: For marketing purposes, a round number like 323 cubic inches is easier to understand than a more precise, less memorable figure with decimals.
Therefore, while different sources might show slightly differing cubic inch values (possibly even close to 327 in some very old or unofficial documentation), they're all approximations based on the roughly 5.3 liter displacement. The variation is due to rounding and the inherent imprecision of manufacturing tolerances. You won't find GM officially listing it as *both* 323 and 327 in their specifications.
