mossbergman Dedicated LVC Member Joined Nov 1, 2009 Messages 1,260 Reaction score 39 Location kansas Sep 15, 2011 #1 it has variable cylinder displacement http://wichita.craigslist.org/cto/2599430512.html
chris2523 93 Mark VIII Joined Nov 8, 2007 Messages 7,912 Reaction score 269 Location Central MO Sep 15, 2011 #2 close. it has Active Fuel Management, aka Displacement on Demand. GMs variable displacement system.