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Thread: Altered class breakdowns in 60s and 70s

  1. #1

    Altered class breakdowns in 60s and 70s

    Recently bought a vintage, updated altered and would like to letter it with the proper letter designation from way back then. I know it was cubic inch to weight but don't know what those breakdowns were. Any help would be appreciated. Thanks, Mike

  2. Racing Junk

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