04-12-2012, 06:25 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 think they were done to K code or HiPo specs so I would guess 3/8". I have pinged one of our real experts here while I check some notes.
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