Thread: "0" Stamped SBC Factory Valve Covers
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Old 09-27-2009, 02:56 AM
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Default Re: "0" Stamped SBC Factory Valve Covers
I have seen the "o" on mostly 68 small blocks. I think they used it to put the valve cover and the "O" to the top at the factory as 68 was the first year they put the PCV in the valve cover.
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