For one, GM opted for an aluminum engine block and cylinder head to keep the weight down, unlike the cast-iron engine blocks of the larger Duramax engines. GM engineers also eliminated the DPF ...

To meet the new emissions regulation, the Duramax 6.6L V-8 engine features: The 6.6L engine's DPF is based on GM-patented technology and proven supplier components. It traps diesel particulate ...