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knocking

  1. Engine knocking and black exhaust

    Engine
    I own a 1974 chevy sbc 350 and a couple months ago my brother drove my truck home from work and said when he went to start it, a bunch of black smoke came out of the exhaust pipes and i could hear the knocking when he pulled up. knocking both in gear and at idle. He shut it off and started it...
  2. Freshly rebuilt motor knocks only when cold

    Engine
    Hello engine builders, should I be concerned? I just started my freshly rebuilt SBC 400. Motor has a new Dart SHP block, new cam, rings, bearings etc. I had it rebuilt by a reputable machine shop who only builds racing engines. I paid extra for the engine dyno and everything performed perfectly...
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