Yup it can shut down to two cylinders and has 3 cam profiles as well. And ability to ramp boost up to 28 psi. It’s very dynamic. But no lifters. The engineer videos show the actuator that shifts the cam to one of the three positions. Pretty slick and simple. 5 years no issues, engineers couldn’t break it in torture test, and passed all the same truck duty cycle testing any other truck engine needs to get through.
Dropping down to 2 cylinders is pretty cool. It can really sip for the empty highway stuff. But as said it can do more work than the 5.3 and is closer to the 6.2 at moderate elevation. Overall economy on fuelly shows its dynamic range ability and and boost efficiency about 13% better than the 5.3. Progress is great. Tow mode negates the afm but it isn’t an issue with this motor.
