GM Upper Engine and Fuel Injector Cleaner is a mixture of solvents, penetrating agents and lubricating oil for use with all carburetor engines. It is designed to:
Remove gum and other deposits from the fuel induction systems of gasoline engines.
Free sticking valves and sluggish compression rings.
Purge excessive deposits from combustion chambers. For best results, it should be used in conjunction with an engine tune-up.
Do not use this solvent in the following applications:
Front or rear carburetors of 3 & 2 setup.
Secondary barrels of a 4-barrel carburetor.
Rear carburetor secondary barrels or front carburetor of a 2 x 4 setup with progressively opening throttles.
MSDS can be found in document tab above.