I tried searching for this issue without any success. My situation is a bit different than everything I have read, so I'm hoping the gurus here can give me direction.
I have an L20b (likely from a 200sx due to the dogleg that is with it) that went through an entire, overpriced and drama-filled, rebuild in 09/2016. I wouldn't trust the builder with flushing a turd, so bringing the car/engine back to him is not an option. With that said, there is virtually 0 miles on the rebuild since I have been working on other things to get the car ready to drive. So, here is the problem: after the first freeze (not really that cold though) of the year, I noticed a pool of antifreeze under the car. I searched for the source and could only find a small pinhole in the exhaust collector which is where the antifreeze was coming from. There was perhaps 1/2 to 3/4 cup worth on the floor. I held my breath, started the car, and a bunch of moisture spurted out the back. Then came the white smoke. Not a lot (perhaps extended one foot out tail pipe) but is spitted a bunch of fluid. There was some oil mixed in there too...i imagine from the new rings still settling. The radiator emptied quickly.
So, I tried retorquing the head bolts. Same result upon startup. The head gasket is the 1.5mm nismo with new head bolts, part # listed in the DQ.
I'm' stumped due to the newness of the headgasket, the mixing of oil/antifreeze, and the small amount of smoke but huge amount of moisture.
My next step is to recheck the intake/exhaust manifold bolts, but they look okay as of now. Oh, and I forgot to mention that prior to the first freeze, the engine ran like a champ...smooth, a little rich, no pings/knocks, etc. Some oil exiting the exhaust but no moisture or smoke.