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Old 09-25-2012, 12:49 PM
lmsport lmsport is offline
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The Fram HP4 filters to 20 microns while the racing Wix/NAPA only goes to about 60 microns.
I have used the Fram HP filters in hundreds of engines, including every professional racing operation I have been associated with. I have no knowledge of their street filters and cant see why anyone would use them on a SBC when the racing filter is $10.

One thing I have run into on some regular parts store filters is the use of assembly lubes that are incompatible with the filter media which causes the filter media to swell and restrict flow. Volvo had a problem with customers using Slick50 with the OE filter and having engine failures result from the loss of pressure.
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