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I am stuck in a bit of a spot. Like so many others, the rake pipe (exhaust return pipe) wore out, and the back two downpipes broke off. I got the new part to replace the rake. I got the old rake off, but the back two flange bolts in cylindar #5 and #6 are just gone. #5 broke off completely and #6 is just a rusted nub sticking out of the head. I have been trying all day to get what is left of these two bolts out with no luck. I have been soaking them in PBlaster all day, tried heating them up and tried some large screw extractors to no avail. Any suggestions? I really REALLY dont want to have to take the head off and take it to a shop but I just cant think of what else to try at this point.