First up - I haven't done this. Secondly, I would take an educated guess and say no to using a 2.0 head gasket on the 2.4 Reason being is you will end up with gasket overhang into the combustion chamber. This could do a number of bad things. The piston could say hi to the gasket (gotta damage something somewhere like the piston crown or possibly a bottom end bearing. Alternatively it could promote hot spotting around the edge of the gasket (detonation and misfiring = not good) Also it may not adequately seal the combustion chamber (instant blow pass from the combustion chamber around the gasket and it might as well be toast)