A problem that only shows up at normal temp, warmed up

[pinky]

Question, How hard does the upper rad hose get on these cars? seems very firm, not swollen but frim
when I run with the cap off no bubbles come up in the radiator, trying to see if I have a blown headgasket without having a block tester.

all my problems seem to tied to heat.

on the gauge the temp doesn't stay still moves 20-40 degrees over a few mins(4 notches)
i have a 180 stat, using green autozone coolant