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Backfiring

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Old Aug 23, 2009 | 08:04 PM
  #1  
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KOB345
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Default Backfiring

I have a 4 speed 73, every time I downshift I have a backfiring out of my drivers side exhaust. This didn't start until I installed some long tube headers and new exhaust pipes. I know I have a small exhaust leak in the header gasket on that side that I keep on meaning to fix.... could this be the problem, or is it my valve springs and has nothing to do with upgrades?
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Old Aug 23, 2009 | 08:07 PM
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Header leaks will definitely cause backfires. Fix that and the problem will likely go away.

JIM
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Old Aug 23, 2009 | 09:40 PM
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73, Dark Blue 454
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Look for a vacuum leak.
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