Lol, stuck lifter. KA's have a wafer type adjustment for opening valves, its not like a Typical hydraulic lifter in say like a GM motor. Not much to "get stuck".

It prolly is valves,rings, or like dude said Headgasket but if it just got replaced that sounds weird. But you said it smokes so any of the above it could be.

Do a compression test on it and see what happens, that may tell you right away.

GL