How do you replace a cylinder head on a 1994 Geo Tracker?

I recommend you get a service manual; the one the dealer techs use not Chilton, etc.. Ebay usually have these for the specific year. If you are going to do any work on your car you will need the service manual. The head can be removed after you remove the intake and exhaust manifolds, valve cover,head bolts (the 16v engine requires some of the rocker arms be removed to get to the head bolts). The service manual will give a step by step procedure.