I have a 1978 Pontiac Formula with a 400 big block and a new motor, rebuilt heads, but

  • Thread starter Thread starter Bonnie J
  • Start date Start date
White or gray smoke usually indicates bad rings and black smoke usually indicates the engine is running rich or not burning all the fuel. So that is a good place to start in your diagnosis.
 
White or gray smoke usually indicates bad rings and black smoke usually indicates the engine is running rich or not burning all the fuel. So that is a good place to start in your diagnosis.
 
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