EVERY gm package has a RPO and the motor has a RPO. What are they for your truck? If there is no RPO for the ssc it is just a dealer package. I worked for gm and saw plenty of "special" vehicles that were nothing more than a dealer package. FYI there is only one 5.3 liter, same bore, same stroke 96.01 mm bore and 92.00 mm as EVERY other 5.3 Liter.(5.328 L; 325.1 cu in).

