I was wondering, because you all are an impartial group, if you could help me. I have... 7080 AC,7060 AC,220 AC,700 AC, 190XT AC, 1950T Oliver, Waiting on delivery of 2255 Oliver, G1355MM (585), G900 MM,g1000 vista MM, 5000 ford 7600 ford and a host of smaller tractors. 2 combines.. 1466 IH with the 436.I have to say the 436 IH is one of the finer diesels I've ever been around, starts great and torque out the a**. I will begin by saying these tractors are not mine but my brothers(except the 220 which is mine but he uses). We know a significant amount about diesels, and I can tell you that the AC's (426, not 301) run hot and will not start below 50 degrees without a heater. They also have no torque below 2000 rpm, if the 7080 falls to 1900 rpm you have to shift down immediately or you will choke it out. To a lesser extent the 7060 is the same way. The 7080 has a upgraded turbo and inlet pipe and does a better job of not getting hot, but still chokes out. My brother is absolutely now convinced that is just the way they are. Everyone at the Allis forum acts like I am crazy or may pm program sucks, but who else runs synthetic rotella. The answers include...blow out the radiator, bad gaskets on exhaust or intake, injectors backwards or set incorrectly, pump timing. I can assure you these are all correct. After this exhaustive post, is there any help, or from an impartial jury, are these tractors to be relegated to a life of hanger queens?