After replacing the chain you can do a cylinder leakage test and compression test, but the chain must be aligned properly first to have all components in synchronization. You are probably familiar with a compression test. A cylinder leakage test is more involved. If a compression test shows lower than specified compression figures a cylinder leakage test can be carried out to better determine the over all condition of the engine. It is best to carry out a cylinder leakage test with the engine at normal operating temperature (if possible).The spark plugs are removed from the engine. Each cylinder is brought in turn to a position where the intake and exhaust valves are closed and 100 pounds per square inch (psi) or air is put into the cylinder. What ever amount of air that leaks out is the amount of cylinder leakage that cylinder has. For example if 100 psi of air is put into a particular cylinder and 20 psi leaks out the engine has 20% cylinder leakage on the cylinder. The technician will listen to the exhaust pipe to see if any “air” is heard to escape from the exhaust. The air intake pipe to the intake manifold is removed and the technician will listen to hear if any air is heard coming from the intake manifold which would indicate an intake valve that is not sealing properly. Try calling several Saturn dealers and ask them from there experience is likely the valves are bent if the chain broke?