I was offered a 3.8L v6 (short block). The guy has a block that supposably came out of a GN (no proof though) that he want to swap in. Is there a difference between the GN blocks and the 3.8 that came in my first Regal? I'm just wondering! I'm going to grab the V6 for when my kid turns 17 so he can still afford to drive the car and I wont have to put new tires on it every week. 8)