No, the motor is all stock and it’s been like that pretty much it’s entire life the truck was originally owned by my father and he’s never LS swapped it but I believe he could’ve most likely put that LS emblem on the truck now that I think about it the LS emblem probably isn’t original after all.
I own a grey 1998 c1500 and I have always wondered how common is this color and my truck also has an LS emblem i wonder if thats common with these pickups i tried looking for the same thing on other trucks of this model but couldnt find anything