Is it at all possible to do this without pulling the engine?
Also, are there any additional gaskets, etc, that would have to be replaced due to the teardown? What about special tools?
i'm not sure if its possible to do it with out taking the engine out, because u would have very little room to work under the car but it could be possible. since you can take the heads off the car without taking out the engine. but it would probably be hard and take a lot of more time to do it. from my experiences with motors I've always taken the motor out of the car, and that usually takes about an hour or two.
as for tools all you really need is:
the pliers to take off piston rings(don't know the correct term)
i don't remember the name of this but its basically rubber cover that goes over the thread on the end of the connecting rod after you take off the caps so that it doesn't scratch the bore of your engine when you take out the piston. (i can ask what the name of it is, if you have know idea what im talking about)
and an engine stand
o yea and a rubber mallet is always handy
thats all you really need if you just plan on changing the piston rings. but if you decide to do a complete tear down and clean everything out and rebuild it your gonna need a little bit more tools and lubricants
as for gaskets i say if it needs a new one replace it, but if its still good dont worry about it. but i know some people replace the exhaust gasket every time they take off the exhaust manifold.
also when you put the head back on torque it to spec in a spiral.
and only torque things half way and then go around and torque them at full specs.