how will i no if headgasket blow

SYMPTOMS = While smoke (steam) from tail pipe + sweet smell of antifreeze - - Engine misfire upon start up after extended park - then misfired quickly subsidies - - Engine overheating - - Excessive cooling system pressures - - Mysterious disappearance (loss) of engine coolant (no obvious leaks) - - Milky or odd color crankcase (engine) oil - - *Hands-on* testing / evaluation by ‘experienced’ mechanic is the BEST way to determine! Good luck!