im not sure if my car has a blown head gastket but it seems like its missing and smoke is coming out of the exhaust when i rev it up(more than usual) and also smoke comes out of that area im not sure whats the proper name but its where you pour the oil in...whenever i take the cap off...also i notice the rpm gauge stick is slightly above zero and usually it always starts above one and gradually lowers as the car warms up...not sure if that means anything.