1989 Chevy Corvette smoking problem

1989 Chevy Corvette mileage: 49,200. My 1989 Corvette, has developed a serious smoking problem. The car is well maintained, oil changed regularly, and is not driven in the winter, and has only 49,000 miles. The problem came out of nowhere, it wasn’t a gradual thing. Thick white smoke billows out of the exhaust (it smells sweet, doesn’t have any type of blue color to it). I checked vacuum, and it was ok, I also did a compression check, that was ok. I then removed a valve spring from the right side of the engine to check the condition of the valve seal (it looked brand new!) Before I go through the trouble of replacing the valve seals, I figured I would get some advice. (The color of the smoke has me confused, it is so white and thick, and it doesn’t smell like oil) Any advice is appreciated.