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  1. M

    ...musical 'flat-tappet' oils

    hey peeps - so I've spent several hours scanning the lab results from 540rat and I'd like some confirmation about what the 90,000 psi 'magic number' really means. Is that the 'requirement' for flat-tappet cam engines? I own several 'flat-tappet' hot rods, including my mighty Cummins 5.9 (solid...
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