I replaced my port elbow on a 120 2 wks ago. 2 came out with a breaker bar after using oil. One, the head of the bolt snapped off leaving a stud (best scenario). A good quality bolt puller brought it out w/o a problem. The 3rd one was froze stiff. Oil, language, tapping with LFH (using the ball side of the hammer, lightly). Two days was long enough
!!! Out came the breaker bar! Out it came
I re-tapped the holes, new bolts coated with anti-seize. Life is good. Starboard is waiting for the day I'll pick up a fresh bottle Medicine.