I recently bought an align 600n pro and everytime it runs gas/oil leaks down onto the ground from the cooling head. Could this be leaking from the piston or do you think it is dripping down from the muffler (even though it is sealed with silicon/gasgets) ? I have about a gallon of gas through the helicopter and it runs fine Id this ok/normal or does something need to be changed

Have you had the engine out to check the head bolts? It might be the bolts are loose and
allowing it to leak. Is it running rich to compensate for the loss in compression due to the
leaking head gasket? I would check those first.

If it's real rich it will blow fuel out the carb also. Pull the engine and just make sure everything is tight to start with.