02-25-2013, 06:22 AM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Those are the conical shaped trim ring, Cobras have more parallel sides like Jeffs. 289 and 427 are the same.
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