2012 Hummer H3 Alpha - A 295-bhp 5.3-liter small-block V-8 has found its way into the engine bay of the H3. Anyone who’s driven an H3 knew a V-8 was much needed. A 295-bhp 5.3-liter small-block V-8 has found its way into the engine bay of an H3 whose front end has had numerous adjustments. They include a modified frame, a new steering system and beefed-up drivetrain components. The front and rear differential housings are now of rugged cast iron, not aluminum. This purity of off-road worthiness is what gives this H3 the Hummer’s Alpha badge, the second model so designated.