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Oil Bypass


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GM v8s have always had an oil bypass in the oil filter adapter on the block. The anti drain back valve is in the filter. Although the new AC Delco E core filter, the ADV functions as a by pass valve.

 

http://www.autopartswarehouse.com/details/...AC25014006.html

 

Edit... I have seen some references that the bypass valve could have been eliminated in the block some where between 2007 and 2009. I can't confirm this as a fact. The AC Delco PF 48s all have a bypass valve in the filter as the original PF 46 does not, unless its an E-core filter.

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Most all engines have a oil relief valve built into the oil filter housing. High quality oil filters will also have a by-pass valve (calibrated spring) to prevent oil starvation in the event the filter becomes clogged.

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