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Old 07-14-2013, 03:41 PM
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shadowgray396 shadowgray396 is offline
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Join Date: Dec 2009
Location: Oregon City, Oregon
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I have seen a "TR" or a "A" markings before on 66. They should be a 7/8 hex bolt. I have heard of many head marks that are know and accepted. My friends 66 Corvette has the 'A" mark on his.
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