I finally got my firewood under control, have nearly 12 full cords bucked, split and stacked under cover. Thought I would finish the clutch job on the 94 before the weather turns, so I removed the clutch, easy enough, and went after the 18mm flywheel bolts. Right away I notice one is odd and another is really rounded off. (I think this is why the PO sold the truck!). The odd bolt backed out easy enough and the others came loose with a breaker bar. The rounded off head is giving me fits. I punched it with a center punch to hopefully loosen it and pounded a 17mm onto it but could not get it to budge. I have applied heat with propane with no luck and have tried coaxing it with a cold chisel. I was reluctant to try to drill it out but couldn't think of anything else so I used a cobalt 1/8" for a pilot hole, drilled slowly with steady pressure and cutting fluid but hardly made a dent. The bolt is low shouldered and has "11" stamped on it. Any ideas?