On a vacuum diagram for a 1980 Chevy 3/4 ton truck with a 350, what's the difference between a vacuum line coded white versus black versus dashed black and white?
by 
roskeeto
ANSWERS: 1
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I don't understand your question exactly, but generally if you have a Dashed line on a diagram,it means that it may only apply if there is certain Equipment installed on the Engine, IE:Cruise Control, or Emission Device that would require a Vac Connection to a Specific Port, or Control, so it may or may not exisit, depending on your Application and specific Equipment, or Options.
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