For the EL, the head is bigger because it's an OHC design - the Powertech head contains only the valves, since the camshaft is in the block. For the newer Falcons, i.e. BA and above, the head is even bigger due to its 4 valve per cylinder and DOHC design. This is also a big part of why the Falcon engines have so much more power than the Powertech engine.
The Falcon engines now have more sophisticated control systems as well, with stuff like dual independent variable valve timing, variable length intake manifold, more knock sensors (I think?), etc etc.
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