From one of the above 'sticky'...
In the article:
Oil Filter with Internal Bypass
The 5.3L LS4’s oil filter now features an internal filter bypass. The bypass is a safety device that protects the engine in the event the filter is neglected for an extended period. If the filter becomes completely clogged with debris, the bypass opens and prevents the filter from restricting oil flow through the engine.
Previous LS4s had the bypass mechanism installed in the oil pan. Moving the bypass to the filter improves engine assembly efficiency and insures that the mechanism is fresh and unobstructed each time the filter is changed.


So should I stay with AC Delco? And is there a larger or longer version that would be a good thing to use?

 

in '07, the oil filters changed from pf46, to pf48 on all the LS style engines... '97 to '06 4.8, 5.3, 5.7, 6.0 used the pf46, and '07+ use the pf48...

 

That is good to know! Thanks.