You probably have an RS/SS..yes, it must have an X-11 code if it were an RS, but if it does it doesn't mean it's an SS. Heres a quick, not 100% reliable but maybe 85% way to tell an SS car...All SS's in 67, 68 and 69 had duel exhaust, right? Ok, it could be ordered on any V-8 but not real common..right? so..... Look at the unibody frame rail on the LH side...this especially works on 69's.. Ther MUST be a heavy metal plate welded in the frame around the inside of the tire. This was used for the exh. hanger..If it has this, it's a good sign it's an SS.....About 69 Camaro 350's...prior to 1/1/69, 350 equipt Camaros were ALL 4 BBLS, had the large fuel filter, and chrome air cleaner lids...they looked like SS's! RPO was LM1...it was rated at 255HP...A rare car! Also, the TH350 trans didnt come out until after 1/1/69 so all automatics with LM1 were PGs!!!!! Last thingcars built before. to 1/1/69 didnt have X codes.