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Old 08-20-2007, 07:28 PM
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Join Date: Oct 2002
Location: Fairfield, CT
Cobra Make, Engine: HM-2027 / 427 SO
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The C6AE-U heads are not the lowriser port heads. Those were the C6AE-R. your heads are the smaller velocity ports like the C6AE-J, L,Y and later C7AE-A,C8AE-H.
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