z28 justin

So I put my new pushrods in and got the rockers all on and tightened down correctly (I think). Anyway, when I started the car, it fired up, but then after a minute or two, the exhaust started to smoke, nothing else, just the headers. I know I probably got some oil on them from running it with the valve covers off but it appears to be white-ish smoke now as apposed to the blue burning oil is supposed to be. I guess my question is, what else could this be if not oil?

Wild1

White smoke is typically water (steam).