I just changed my left head gasket only. No valve job. No valve stem seals. No camshafts, or lifters. I also did my timing chain and guides because it was necassary. I also replaced the cam oiler tube plastic fittings. When replacing a head gasket you may end up breaking the rubber cover that connects the airflow sensor to the throttle body. You should also replace every piece of rubber hose under the manifold. Look for some of my other posts on this. Also an area of concern is that the threads are not helicoiled from the factory. There is a risk of stripping threads and requiring inserts. The drill guide for re threading cost ~ $1600.00$. If you strip one you will need to purchase this tool or make it out of an old head.

John Roncallo