[Isphius]

the 3.1, 2.8, 3.4 etc, etc are 60 degree v6s, and have pretty much the same block. Thye are "even fire" meaning the 2 cylinders go off at the same time, so they dont have the loopy idle like a v8. They do run into some problems and whatnot, but are very good motors. My dad and I had a 5 speed 86 s10 with a dohc 3.4 in it (lq1) from a lumina z34. It made about 220 hp, very fast truck lol. It was unfortunatley destroyed by a drunk driver going almost 60, pretty much destroyed every bit of work we did. Anyways, the 3.8, 4.3 v6s are 90 degree v6s, similar to the small block. Basically a 5.0 and a 5.7 - 2 cylinders as supra90turbo said. And that thing is true with gm vehicles. They wont break their motors or tranmissions but everything else will goto shit, especially little stuff inside that is annpying but not important enough to fix. But they are great motors if you dont like to work on your car, There just a little frugal with power. plenty of torque tho! Plus they make that eaton supercharger...