Flying yesterday in the DC area my CHTs ranged 300-315 while my EGTs at times topped 1400 at 75% power. And for the first time ever, one cylinder's EGT slightly topped 1400 (i.e., 1407) during takeoff with full rich and WOT. [In the summer months temps usually run around 350 and 1350, respectively.] All CHTs are close to same. EGTs usually spreads within 30 degrees. Are these numbers within "normal" for an IO-360?