I'm removing the top end of my Suzuki GS500e to have it's header threads helicoiled, I've removed the cylinder head but the barrel is completely stuck to the crankcase, a friend and I can lift the engine by the barrel and shake it and its not freeing up. Since its air cooled I'm apprehensive of using wooden wedges out of fear of damaging the cooling fins. The maintenance diagrams show only the 8 studs that come up from the crankcase, through the barrel and are bolted down to the cylinder head + a pair of locating dowels but I'm not sure what those are made of, and they are not accessible anyway.
I've also knocked it about with a rubber mallet on the casting points (not fins). There is very slight movement prying from the back of the engine over the available solid surfaces. The pistons move freely.
Any ideas on how to unstick this?