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  1. bigpapiray

    454 knock retard

    Okay so I have. 97 K2500 burban 454 bbc 7.4l... I put Gibson headers, new 02 sensors up stream cat delete, 3” exhaust to a black widow muffler 3” single out the back, egr delete err o2 delete. Full tune up, reprogrammed/tuned(sinister performance), FPR, motor man 4squirt injectors, new knock...
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