The 2006 and up 4200's had 290 HP in stock trim and are only 256 cubic inch, compared to the 140 or 150 HP of the 292, and later year production 292 were as low as 115 HP. They are in Trailblazer's and other GM products like that. The pre-2006 4200's still had 275-280 HP. So they have a much higher HP to cubic inch ratio and technology on their side that makes the difference.


Class III CNC Machinist/Programmer