my tuned grp n ever got over 205 degrees on break in ...the only time it got around 220-230 was when i first cranked it ...before the first crank i leaned up the bottom a bunch ....big mistake ....i went back to stock settings after cranking the first crank ...and i just barely leaned the lsn a tiny hour at a time until it would crank and idle ....trust me it is very easy to get these motors to lean ....after i came to my senses ...it idled 3 tanks flawlessly at no more than 205 ...after having put a gallon on it and raced it 2 times ...its just a dream ....i was running as strong as anybody last race out ...i was running some practice laps while alan burton was fueling me ...he asked me do you want more ...i said its running awesome whats the temp ...he said 170 degrees ...i just said let it go ...ran that way all day ..plenty of power to spare ....i love these engines its no wonder they last many gallons if broken in right and kept clean ....