LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Spark plug?

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Old 09-12-2008, 07:45 PM
  #16  
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Location: Lake St. Louis Mo.
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Header being loose can play a part. You need back pressure on all cylinders. i had the same problem when my headers were loose. I still have one bolt to get in it but just tightening the one made a big difference.
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Old 09-14-2008, 12:10 AM
  #17  
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Ok I am going to install a new felpro 1406 gasket and I hope that is it.
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