Hey Timmahh, I have been sorta thinking the same thing about the temps from that corny duratrax thing too. I wonder if it was playing games with me. But then again, once it read back to me around 415, and said OK MAYBE THIS THING IS BULLING ME. So i went ahead and drove it. And like just a minute later, it wasn't making the sound anymore where the piston is was moving. It sounded flat, and started to smell like fire! During that setting i had the High Speed Needle about 1/2 turn out from flush. And i know for a fact if i go in, the tempertures will raise even faster. But sometimes when the needle is OUT like that, during a high speed pass, she'll go really fast for a few seconds, then RPM starts to die slowly, even if you're holding the throttle all the way down, and just shut down. But if i have it Leaned out, i'll get great results however......i get them numbers climing over my head even idling. It's like i said before, i'm just about done with a whole gallion of fuel with the truck doing this. Sometimes, i wish it was the same engine from the LE version, because after break in, i did exactly what i did to the LE, and BOOM, i had NOOO problems at all. I did the same to the GST, and whoooop...there it is. Over heating issues. And as for the other question, during break in, i was getting something like 250 - 340 degrees. I didn't move the needles at the time since i was instructed not to. The only thing i did was lower the idle 15 minutes out. Which i had done to the LE too. I do NOT have Idling issues. I just have over heating issues. If i could, i would trade this GST engine for a LE engine. This is just rediculious. I know if i call CEN today, which i will, they are going to tell something i already did to the truck.