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  1. O Rocker - sideways "O"?

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    After reviewing several posts, I think the big "O" and small "O" rockers were on 302's and other hi performance chevy motors. And I think in the 70's, the GM cast changed from "O" to "V." I read on one of the posts that the sideways "O" was not a GM rocker but was made by TRW. Did GM make...
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