I have a 2001 f150 xl 7700 bifuel 2wd. I am trying to get the valve covers off to put in a timing chain set. All of the isolator bolts on the valve covers had to be rocked, pried, and pulled out with pliers. I am now down to the two furthest back bolts on the passenger side, and can't get enough clearance to really get pliers back there to rip them out. Does anybody have any advice on how to get them out of there?