heads come off to put lifters in. Have seen some fail, but not enough to throw it in POS status, and more so in the last couple years..... and the magnum/re trans combo doesn't hold a candle to the hemi stuff. I've really been watching the new 2500 hemi combo. We get one traded in and I'm taking the race trailer for a pull up the mountain pass to get out of the hole I live in. If it does "ok" with my 28ft trailer, race car, golf cart, gear it might be good by 01 CTD. A friend of mine bought one where I work and so far he's ecstatic about the performance and mpg for a 2500 4x4. He works in town doing a lot of short trip driving and his avg mpg is around 14. He's also gotten over 20 on the highway empty. Not always an easy task in western AZ. And Hemi guys.... WHEN "not if" you get an exhaust leak, used copper rtv on the new gasket. My years of "beta testing" this seems to have favorable results (NO comebacks).