Can you put a 2.3 Saturn motor in a 1.9 Saturn?

No that saturn is a pure saturn not like the later gm saturns. You can only put the 1.9 engine and the transmission it came with in that car.

Iam not trying to lie about anything I have never heard or seen that saturn with one.I have worked for saturn dealers for over 16yrs but never heard of that.I really only dealt with stock factory parts day in and day out. There may be a way you can try researching online you would have to change everything though engine transmission computer engine harness fuse boxes axles mounts exhaust and a while lot more.

So basicially with rebuilding the car no way I know of.I would think more money and time then it worth.I have a 1999 saturn sl2 just redid the engine stock.

Given enough money and determination, anything can eventually be accomplished. If you have a $20,000 budget, your own fully equipped shop and a couple experts in computer programming, you could probably pull it off, although it would be illegal to do so. If you want to come back to reality, listen to Saturntech9.