Is Sea Foam good for an ’87 chevy square body’s engine? [SOLVED]

Thanks for the question!

Yes, Sea Foam products are safe to use in an ’87 Chevy Square Body.

If you’re asking about Sea Foam Motor Treatment, you can use it in both the fuel tank and the oil. It will work to clean fuel residues, gum, and varnish in the fuel system, and clean oil residues and deposits in the crankcase.

If you’re asking about Sea Foam Spray, it’s also safe to use on that engine for upper engine cleaning. Just follow the directions on the can.

Those older carbureted Chevy engines are actually great candidates for Sea Foam because fuel gum and varnish is a very common cause of rough running, hard starting, and poor performance as they age.