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5.3

  1. Engine & Performance
    So what first started as a potential cam/valve train upgrade on my basically stock 2004 L59 5.3 (BTR stage 4 V2 truck cam, summit LS7 lifters spec lifters, and summit push rods to match, BTR beehive .660 valve springs, btr ls hat valve seals, and other odds & ends needed for job) I originally...
  2. Engine & Performance
    I get it. "UsE thE SeaRCh fuNcTioN!" I have. Here. On the Google-nets. On other forums, including performance truck, and even asked Whipple and Procharger directly. Been there. Still can't find info I'm after, or it's from 10 years ago, or I'm not understanding it...which could be possible...
  3. General GM Discussions
    Hello, recently my 2007 GMC Sierra 1500 5.3L NNBS has developed an issue While driving at relatively low speeds there is a distinct pop sound when switching out of V8 and into V4 mode. it is intermittent and only seems to happen while traveling under 30 MPH. I have been doing research...
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