I know little about traxxas stuff.... I do have a Novarossi 528 3 port that will not run below 260... In the r/c world this engine is known to run in the 270-285 range all day...

.... But i would think that 310- 340 degrees as a common running temp would cause the sleeve to wear out mighty quick...

I know that my engine hit 340 twice at rd. 1 of the pro series and i could notice a huge differnce in pinch after that...

But like i said, traxxas engines arent my "fortay" ... Just my .02