question about my 929?

[htownrider]

Hey whats up guys and gals. quick question bought a 929 a little while ago.  The fan sensor switch is bad and I didn't know it.  Was cranking it up to let it run awhile until I put it together.  Long story short ran it hot twice by just a little bit.  After the second time realized it only had water it.  Started to run bad and then not at all.  Everytime I tried to crank her up nothing but white smoke out the tailpipe.  Guy told me the head gasket had blown. Fine leave her alone for a while.  Decide to try and crank her about a month later, cranks up just fine and has been cranking ever since. Anyone heard or know of that.