Hey All, I have a 3406b (sn 4mg15186) that I recently bought and rebuilt. everything on the truck is stock and has all been gone through. With the only exception that it has or3421 nozzles in it now. It has stock manifold and turbo but my exhaust temps climb way too fast and way too high. I barely give it any throttle and it goes to 1100+. I’m afraid to drive it. My belief is that the fuel screws have been backed out too far by the previous owner bc It’s always had more than normal black smoke but didn’t have the heat issue until I put the bigger nozzles in it. I know I should probably just back the fuel off until I get it right but thought someone here might have a more logical answer.