If you are sure that you've got all of the bolts out =>

Crank the engine over by hand - now that the valve train is off - you'll get a little bit of compression that will help pop the head off.

Make sure the timing chain doesn't get tangled when you do this. Being lazy and using the starter instead of a ratchet handle might make an expensive comedy moment. Consider yourself warned.

The head is possibly stuck to the head gasket that is possibly stuck to the block.

Gentle taps with a rubber hammer can also help.

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!