Is the bolt frozen in the manifold it wont pull away from the head. If the rubber hose is keeping you from pulling the manifold away from the head just cut it they are not that expensive. With mine you have to put two of the bolt in the manifold before putting it in as the back of the boat keeps me from putting the bolts in after the manifold is in place. I would be leary on taking a BFH to it as the head is aluminum and likely will crack or break. Do you have pics try the wedges and heat the manifold real hot with a torch and try and pry the manifold off of the bolt. You would need to cut the hose to pull it out straight.
http://www.ebay.com/itm/Volvo-Penta...ash=item33c22ed255:g:3c0AAOSw~OdVbhsa&vxp=mtr
They are pretty stiff it wouldnt hurt to replace it with the new manifold anyways.
http://www.ebay.com/itm/Volvo-Penta...ash=item33c22ed255:g:3c0AAOSw~OdVbhsa&vxp=mtr
They are pretty stiff it wouldnt hurt to replace it with the new manifold anyways.