Well, I just replaced the head gasket on my super efficient car. From 15mpg to 50mpg, I rule the fuel pumps...
(Note: Replacing head gaskets sucks. But spending good $$$ on a top notch torque wrench is nice)
Yep, bastard of a job. Remember doing it on my RB26 some years back but at least I took advantage of it by giving the head a port and polish, new valves and throwing some cams at it.
Still not something I'll rush to do again in a hurry