White smoke on startup mystery.

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I'm using 5w30 full synthetic. I used regular during the break in period and changed the oil 3 times. I know coolant smokes white and thats what my fear was for a while but I haven't added a drop. I am leaving the coolant tank empty and that radiator full. I'm doing this so I know that I'm not sucking coolant in from the tank. Everytime I open the radiator cap I have coolant dripping off of the cap so I know it hasn't used a drop.

I will ad my old catch can when I get back out to colorado to pick it up.

 

As far as the rings go I am positive I got all the rings installed the exact same way. I was so freakin anal about this rebuild as it was my first. I took way too much time making sure it was perfect. I will take the intake off as soon as I am able. Thanks for the advice yall