Clean all carbon from the combustion chambers and valve ports using GM tool J-8089 or a similar cleaning attachment available at auto parts stores, which connects to a common hand drill motor. Thoroughly clean the valve guides with GM tool J-8101 or other comparable devices found at auto parts stores. Use parts cleaner to remove all sludge and dirt from the
Rocker Arms, rocker balls,
Pushrods, and valve springs, working on one set of components at a time and returning each set to its numbered location on your box or rack. A buffing wheel should be employed to eliminate all carbon deposits from the valves, ensuring the order of the valves is not mixed up during cleaning. Clean all carbon deposits from the head gasket mating surface carefully to avoid scratching this sealing surface, and thoroughly clean the threads on all cylinder head attaching bolts.