Originally Posted by secretsquirrel
Yep, newer LS engines weigh less than the N54
The LT1 is 30 lb. heavier than the LS3.
Though with it making about 470 HP, I'm kinda sad it won't be going into the ATS-V. Unless the ATS-V's version of the TT 3.6 V6 makes significantly more than 420 HP, would rather have the LT1 in the ATS-V. Can't imagine the fuel economy being that much better with the TT 3.6 vs the LT1( since the LT1 uses about 12-18% less fuel than the LS3).