if you are wondering about the factory cam # its 25527480 -----this is the cam that was installed in the engine---------the factory replacement part is 25517479-------don't know why they have different numbers but they both are: 193/197 250 intake lift 265 exh lift sep 107 i don't think the 480 was ever available except in a complete engine and i think the 479 has been discontinued for quite some time..............RC