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#1
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They're ECL codes, they note specific items for the factory to use in conjunction with a specific option. These codes could note a different speedometer gear to be used depending on the rear end. This is a good way to bust fake paperwork if you have an ECL code book. Often times the forgers don't use the proper ECL codes. They may use an ECL code for a small block on a big block car.
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#2
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The M20 info on my 68 Chevelle SS window sticker is somewhat different:
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1969 Chevelle SS396 L78 M22 4:10 Tuxedo Black 1970 LS3 Malibu 400 BB convertible 1970 LS3 Malibu 400 BB coupe 1970 Chevelle 300 series LS3 400 BB coupe, special order Monaco Orange 1970 Chevelle Concours Estate LS3 400 BB wagon 1970 Chevelle SS396 L78 M21 3:55 Tuxedo Black |
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