[Pedro]

Hi Nick

I had the same issue when I took the front engine bolt out to fit crash bungs, it was just corrosion holding it. Undo the nut a couple of turns then give it a good smack with a drift and two pound tuning fork. Might take a bit of brute force.... Best not to hit the threaded end without the nut still in place to protect the thread

Plenty of plus gas should help.....eventually! Gis a ring if you get stuck, might have something else that will free it

Ped