CHEVROLET 2010 Impala - Manual (Page 371)

Engine Specifications
Engine VIN Code Transmission Spark Plug Gap
3.5L V6 N Automatic 1.01 mm (0.040 in)
3.5L Flexible Fuel V6 K Automatic 1.01 mm (0.040 in )
3.9L Flexible Fuel V6 M Automatic 1.01 mm (0.040 in )
6-101