03-25-2011, 09:09 PM
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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
I believe the 427's upped the diameter to 1-3/8". The way it's attached to the cars lightweight tube framework I don't think the diameter or wall thickness matters.
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