Pontiac 2005 Grand Prix - Manual (Page 399)

Engine Specifications
Engine VIN Code Transaxle Spark Plug Gap
3800 V6
231 CID (3.8L L26)
2 Automatic .060 inches (1.52 mm)
3800 V6 Supercharged
231 CID (3.8L L32)
4 Automatic .060 inches (1.52 mm)
5-109