7. As you can see by this photo, the new EcoTec3 engine doesn't share any parts from the previous generation Vortec/LS-based V-8. When GM calls it all-new, it really is. When we asked Jordan Lee to tell us about the performance of the new EcoTec 5.3L (L83 engine code), he had a smile on his face and answered. “We pride ourselves in a very broad torque curve. We want a lot of low-engine-speed torque for towing, for off-the-line towing, and for relaxed cruising when you're towing a load. Our V-8 engines are designed, tuned, and even validated to be truck-specific." He went on to say, “I gotta tell you, I'm also quite happy with the fact that they're hot rods. This L83 will smoke the tires pretty easily, and when its bigger brother, the 6.2L, comes out, that thing is going to be extremely fast."