The eighth VIN position identifies the engine. This is important since many parts guides require the engine VIN to correctly identify the engine. For example, this guide covers a 3.8L (VIN K) engine and a 3.8L (VIN 1) engine. The VIN K engine is normally aspirated while the VIN 1 engine is supercharged. Knowing the correct VIN of the engine is key to getting the correct replacement parts.