Does anyone know if the DRZ400 head bolts are bottom tapped and prone to hydro locking and popping the block if there is coolant or oil in them when you torque your head bolts? I heard some interesting sounds when torquing my last head bolt on the first pass to 18ft pounds, realized I forgot to check and make sure those holes where dry! I pulled that bolt and the bottom looked good and dry but also extended beyond the threads. Could have been one of the other bolts I suppose but I would have heard a crack upon torquing those bad boys and I don't feel like puling them all and compromising my HG. I have done car heads before and when you are torquing 80+ lbs you hear crazy stuff that makes you feel like you are in the titanic, at 18ft pounds though it just didn't seem right to hear any tinging. I guess I won't know what those sounds where for a while. It resembled the sound an exhaust header cooling down on a cold day after a hot run, PING!