Plenty of big wins over P5 teams in past 50 year.
P5 wins since 1970
arizona 6x
asu 4x
baylor 1x
boston college 1x
cal 3x
colorado 2x
georgia tech 3x
kansas state 3x
miami 1x
michigan 1x
michigan state 1x
mississippi 1x
mississippi st 2x
missouri 1x
nebraska 1x
notre dame 2x
oklahoma 2x
oregon 3x
oregon st 4x
penn st 1x
pittsburgh 1x
syracuse 1x
tennessee 1x
texas 4x
texas a&m 2x
tcu 5x
ucla 3x
usc 1x
utah 25x
virginia 2x
washington 4x
washington st 3x
wisconsin 2x