Interesting.........

http://www.truckblog.com/story-1602-2010_duramax_diesel_v8_sneak_peaksurprise_no_manif olds

i'd like to see how thats going to work

what will they think of next?

makes less weight 4 sure.

"Technical highlights of the engine include aluminum cylinder heads with integrated manifolding;"

it technically does have them, there are just an all in one design