[fastfredracing]

O.K. I have a dodge truck, 4.7 that came in the shop for a head gasket. This truck does not overheat, but when cold, and only for the first 250 yards, it does pour out some white smoke that smells like anti freeze. The customer stated that he has been adding small ammounts of coolant. There is also some staining around the muffler drain hole, that looks like ant-freeze residue.
I have checked with my combustion leak tester, cold/warm/and hot, and cold/warm / hot under load, and my tester shows no combustion gasses in the cooling system. I 100% believe that combustion gas testers do not lie. You either have a leak, or you do not. I have pressure checked the system, and it holds pressure for as long as I leave the tester on there.
So this is more of an automotive theory question. If there is indeed coolant getting into the cylinders from either a faulty head gasket/cracked head, or cracked block , then there should also be combustion gasses present in the coolant system. If you think about it, the cooling system pressure is only 15-18 lbs, where as the cylinder pressures are at least 150 psi.
The only way I can think of for coolant to make its way into the combustion chamber without also having the presence of exhaust gasses in the cooling system would be for it to enter somewhere before the intake valve. Be it maybe an intake manifold leak, or a crack in the head that lead into the intake port somewhere.
I have done 100's of head gaskets over the years, and cannot ever remember seeing coolant enter the cylinders without my tester showing the presence of combustion gasses.
Curious to hear your theories.