After I got my head rebuilt because of 4 bent valves, the car ran fine. Now after about 5 miles, the car just suddenly started smoke white out of the exhaust. It happened while idling in my drive way. I can smell coolant and I checked my oil, doesn't look like it burnt any but I'm not 100% sure. I can still start the car and it will idle but like I said, the revs jump and it smokes A LOT. I'm hoping its just a seal but I don't kno because my mechanic won't be able to come check it out for another week! BTW, its a 2005 WRX.