Does 4.8 gm motor have afm?

Answer 1

No, they do not. In 2010 they added VVT which gave a slight improvement in HP and flattened the torque curve nicely. I have a 2010 LS extended cab with the 4.8 and I love it. It still has the 4l60e, although I'd prefer the 6l80e that comes with the 5.3 and 6.2, but it's still a great truck. I consistently get much better mpg than what the EPA estimates are. I hear with the 5.3 with AFM your AFM works less with larger wheels/tires, because of the added mass moment of inertia they give you. For the Gen IV LS based motors, they are talking about AFM, dual VVT (seperate cams for intake and exhaust), and direct injection. That's for the trucks that are supposed to come out for the 2014 model year. That's about a year and a half out, so don't expect solid word on everything. It's getting about to the time they should start designing tooling for the factories to make the new trucks, so more solid word on the trucks should be out soon. Also, GM typically likes to introduce new LS based engines in the Corvettes. So for new corvette, expect to see a high-performance version of what you will see in the trucks. The trucks tend to have different intake manifolds and tuning to produce low end torque which ends up with a little less HP. That was a wordy answer, but that's what happens when a mechanical engineering student gets excited to answer your question. I'm an enginerd.