Exhaust manifold bolts

Keep soakin em. Also a 'heat-up' with a torch, then squelch with a 50/50 mix of ATF and acetone. Then when the time comes to remove the bolts, be patient. Your first direction should be to TIGHTEN (clockwise) the bolts, ever so slightly. Then, carefully begin counter clockwise rotation, and occasionally, clockwise, then counterclockwise repeatedly until the bolts come out.