That 6.2 is completely different from the SBC and LS series, it's a great engine. A friend just got his '19 Denali 6.2. Really a nice truck and he likes it. I've been driving diesel since '04 and wouldn't go back to gas. Now my friend also has a '13 Denali diesel which he's selling. He likes the new gas truck but misses the diesel power, says he wishes he'd bought another diesel instead.
