There is 460 lb-ft of torque available from both the 5.3 V8 and the 3.0 Duramax engines. In comparison with the 5.3 V8, the 3.0 Duramax engine delivers only 1500 RPM, while the V8 delivers 4100 RPM. Driving on the highway is a whole lot more comfortable with this. V8 engines produce less power than 3.0 engines because they need to work harder.