Thread: 427 casting picture
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Old 01-05-2007, 07:15 PM
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Cobra Make, Engine: HM-2027 / 427 SO
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The block in question has a C3 casting number. And yes the 406 was a 62.5-63.5 production option. The 406 C4-A service block was available until 66 when the 428 was introduced.
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