MO 352 to disassemble butt

Hello everyone, I am looked with a gossip that should have arranged a long time, it is a New Holland 1550 harvester, from the 80s, has already worked something hehehe, the problem is that a couple of years ago a warm I have removed the nuts of the asparagus but the cylinder head is still stuck, the only thing I see that you can miss for removing are Allen screws that are satin with the cylinder head, in 17, ahinque remove them tb ??? Have if anyone knows this type of engine, thanks