Originally Posted by strad
.......... the manifold to riser gaskets and also the rust stains on the manifolds (latter is why I would like to remove them).
Is it broken or just not visually pleasing?
A few days of penetrant may or may not do it. Give it a few days but also approach it the way you have been. No more forced torque in my opinion. I'd hate to have to deal with that under less than ideal conditions, when in fact, it wasn't broken in the first place, but I'm also more practical than obsessed with things that make you go "Hmmmmmmmmmmmmm..."