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How much can you over-bore a 389

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12-12-2002, 10:23 AM

khogan

khogan is offline

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Join Date: Sep 2002

Location: Colorado

Posts: 60

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I have a 389 ('66 GTO) that needs cylinder boring to clean it up, but it is at .060 over already. Can I safely go bigger? Will I need custom made (expensive) pistons for this?

Thanks
Ken

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