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Old 06-28-2012, 11:04 PM
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It should be rather easy to tell if they are for a GM. It don't matter any what shape they are, it's effect on flow isn't enough to even worry about, especially in a street application. There's been SBC heads with "D" shaped ports, oval shaped, or the stock shape and unless you plan to spend some money on a set of custom headers to match the shape of the exhaust port standard headers work just fine.
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