MT.. the vortec motors put out a lot of HP.. the v8's are pretty amazing in a truck.. We got one for work, it is a gmc (same thing) with a vortec v8 4 speed auto club cab. I told all the guys that the only one who could drive it was one of my guys who has never gotten a ticket in his life.. the darn thing will smoke one skinny tire for 100 ft.
but... even my puny little 468 big block is ah... different.. I can only imagine what a 572/740 will be like... hopefully boxer and finestein and kerry won't get em banned as assault motors.
lazs