Ok, I have a 2000 Disco 2 with about 150,000 miles on it. I had a HG replacement about 1 yr ago, the entire coolant system is new (rad, T/Stat, hoses, water pump). Now here is my problem. A year ago I started having problems where my fluid was inexplicably getting lower. But I didnt have any of the tell tale signs of a HG failure. So I replaced the entire cooling system (which i figured it probably needed anyway). Anyway, that didnt fix my problem at all. So i took it to a shop and they said a HG failure. Which I decided was probably appropriate consdering how much you hear that. Anyway, got the HG replaced, and when the HG was removed there was no obvious sign of failure, in fact it looked pretty damn good. Anyway, it seemed that my problem was gone, however I didnt get to drive it much as I am gone more often than not. So I get back from a trip a week ago and start up my car and plumes of white smoke come out, no odd odor that i noticed. And it does this everytime I start my car until she is warm (around 170). And I am also losing a little coolant at what seems to be an average pace for actual running time (its about 1/4 of the coolant resevoir for about 6 hours drive time). I also get a #3 misfire if I apply any gas before the car is warmed up, but if I let it warm up prior to giving it any gas I dont get any misifre. So I took it to a shop and they said that I have either a cracked block or slipped liner on number 3. However, it passes the chemical leak down test. So I am completely stumped. I have a block from a 99 Disco 1 in my garage, and I am tempted to rebuild that, but I am not sure if the blocks are exactly the same. Are they? Any help or comments would be greatly appreciated. Thanks.