WHAT DOES 454SS SEATS MEAN?

I am marketing a nice 1972 Chevrolet (Chevy) Chevelle SS 454 Tribute motorized vehicle. A real American muscle mass motor vehicle or truck. The motor vehicle incorporates a brand new 454 Main BLOCK motor with about 8k miles that Appears terrific through the aftermarket headers and twin exhaust. The motor is again by an automated Th400 car transmiss