340 camshaft question, yea another one.

How do you figure 4 sizes?
20-224-4 - Xtreme Energy™ Hydraulic Flat Tappet Camshafts
I see XE274H,pn 20-224-4 is;..... 274/286/110, and 230/236 @050
The factory 340 cam P4452782... 268/276/114, and 220 @050 IIRC
The advertised affects the Dcr
The 050 sets the performance

I see about 1 size in advertised, 1.5 sizes in performance
Please don't tell me my memory is going............