Are you sure you've got al lthehead bolts out? On the older engines there are three rows, one on the valley side, one on the exhaust side and a third row outboard of the plugs. The third row have since been deleted on later engines, as they cause the heads to tilt outwards and leak into the valley, so don't replace them when you re-build.
The block face has protruding dowels onto which the head locates and they will prevent you knocking the head off sideways, so don't try, you'll damage them.
Have the heads been taken off before? They may have been stuck back on with jointing compound, which is strongly advised against in the workshop manual.
Good luck!
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Geoffrey
1985 4-door Range Rover Classic
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