07-22-2011, 05:37 PM
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CC Member
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Join Date: May 2009
Location: American Fork,
Ut
Cobra Make, Engine: 66 Cobra
Posts: 930
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Not Ranked
Have you had your air/fuel ratio checked. Too rich a mixture will allow unfurned fuel to ignite in the exhaust, especially with a large overlap cam. That popular loping sound is less than ideal combustion making it's way out the exhaust.
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