I have completed a full engine rebuild, down to the bare block, of my Tacoma. Replaced all the gaskets, cleaned and lapped all the valves tight, tuned the valve lashes to spec, cleaned everything, replaced the starter, torqued to spec etc. It was a 3 month effort working on it a couple of nights a week.
Last night was the turn key night. I must admit I was nervous, as it was the biggest automotive repair I had ever done. The engine started fine but then I notices something like smoke coming out of the catalytic converter and around both the exhaust manifolds. I thought it may be the excess engine assembly lube I used to put everything back together but soon I realized it wasn't smoke -- it was steam. When I went to the tail pipe, it was confirmed, the vapor coming out was definitely steam and there was some condensation inside the pipe as well.
I wonder if this is normal for a major rebuild that perhaps some moisture condensed inside the cylinders and it had to find its way out.
I ran it idle for about one hour, steaming had stopped, then drove it about 20 min and everything was fine.