George, that Purolator DOES have a pressure relief valve. You do know that not all filters have a pressure relief valve that is visable from looking in the can, dont you? Just because you cant see it, dont mean it isnt there.
I think the old AC Delco filters had a pressure relief valve by the threads of the can and it looked like the anti drainback valve. The valve did both though. Read the old mini mopar site and he shows an old AC Delco filter from 1999 (they have changed now but its worth looking at since it shows that valve type). http://www.minimopar.net/oilfilters/index.html
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Cut your used filter open, that would be the only way to find out for sure. Usually a OEM filter is contracted out every couple years, sometimes even more often than that. There would be no easy way to tell who made the filter without cutting it and there is no guarantee that it will be the same as the ones on the shelf right now. Thats why I recommended that you cut open a filter and if its to your liking, buy that vehicles life span of filters now because next year, they could be made differently.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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