I have to disagree a little , remember when burn downs crearted too much h.p. in the hemi top fuel cars? most always resulted in loss of traction and up in smoke.
My hemi would make more h/p the hotter it got to a certain point , and always hurt my tracttion , it was traction limited back then tho-----bad strip for huge torque and h.p. in a heavy car..
Bill jenkins even heated his prostockers to the melting of heads when it came down to the $$ race. Read his book on the ''small block chevy racing engine'' , if u dont believe me .
Other than that I would rather have it cooler than hotter too.