![]() ![]() A deep-skirt block design, where the block casting extends below the crankshaft centerline, also contributes to the engine's stiffness and refinement. GM said at the time, "There are seven nodular iron main bearing caps that help ensure the block's strength under those high combustion pressures while also enabling accurate location of the rotating assembly. Engineers chose a lightweight cast-aluminum alloy block and cylinder head for weight reduction and added durable material for components such as the iron cylinder liners, forged-steel crankshaft and connecting rods, and blended silicon/aluminum pistons. An exhaust brake allowed for engine compression to slow the vehicle to reduce brake use while in tow/haul mode, a particularly useful feature when traveling downhill. Another focus was minimizing noise and vibration. So they added advanced technology including a stop /start feature to boost fuel economy, performance, and efficiency. The Duramax engineers had a blank slate from which to develop the new 3.0-liter inline-six. ![]()
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