Thread: Cobra 427 knockoff spinner thread size
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Old 07-19-2015, 03:56 PM
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Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
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The original thread used on 289 & 427 Cobras was "55". The production 427 knock-offs were actually marked with the "55". Another interesting note was that HALIBRAND used "Harvey Aluminum" and the knock-offs were also marked this way.
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