smog

  1. 77Matt

    Passing CA Smog help - High HCs

    I have a 1977 GMC 5.7L 350 given to me from my dad. It passed smog no problem less than a year ago for the title transfer. Now, it failed CA smog due to high hydrocarbons (3485 ppm @ 15MPH and 1350 @ 25MPH). Also noteworthy is that the technician said the crankcase ventilation hose that feeds...
  2. alc4819

    Headers

    I’ve been thinking on putting some long tube headers on my 86 k20. It has all the original smog pump and air lines running all over the place including going into the stock manifolds. I’m wondering if I put new headers on and block off the lines going to the manifolds if that will create any...
  3. alc4819

    Engine problem

    I’ve got a 350 with a turbo 400 trans, it’s having trouble starting and ides high sometimes, also when a load is put on it backfires and won’t downshift. Anyone else had a problem like this? the engine has a smog pump which I think might be the problem or the carb
  4. Ivan_Drago

    Pass Ca. Smog with new Top End?

    Hi All, first off I'd like to say hello and thank you all for making this Forum so great! This is my first post here and looking forward to many more as I learn more about the intricacies of my truck. So...with that here it is.. I've got a zero rust 1981 K3500 2door chassis cab with 55,000...

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