Originally Posted by chainblu
That looks like one of the early e-cores with the wide spacing. Can somebody decipher the date code?
Good catch and looking at the ST label and number of longitudinal trusses (4) I was thinking the same thing. Champ date code is a straight forward read for as long as I've seen them, therefore this one made 08/17//2009. Previous Champ made ST line.
Pleat spacing on this looks pretty good which as noted was not true of many older ecores. Combined with the wider cage openings, why some blow outs seen. Champ has added more longitudinal trusses to the cage, I believe this one would have at least 6 now. Axial trusses 'may' be greater in number too. Hoot already explained reason for auxiliary base/tapping plate.
Beyond that weakest point imo is the nitrile combo valve used for bypass. That said, used for ~5k mile ocis 'likely' ok. Thanks for c&p.