Is it possible that ALL the coolant in my radiator would drain out of the rear exhaust because of blown head gaskets? Or am i looking at a cracked block or some other problem. The coolant lost seems excessive for head gaskets even though i know its building up after every attempted start. I tried starting it 4 times, the car cranks smoothly, its getting fuel and good spark, just wont turn over, then all the coolant poured out of the rear. No leaks from the Intake manifold, cylinder heads or any other part of the engine in general except the exhaust manifolds->back. Ive replaced the optispark, water pump, thermostat, coil, radiator, alternator, battery, resealed the intake, changed all fluids (oil was not milky upon change) and made sure everything else was hooked up properly. Anyone had this problem before? I dont want to replace the head gaskets just to find out the block is the problem. Any help would be appreciated as id like to get this car running again.