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The engine plant stamp was done on big-blocks BEFORE the heads went on, and AFTER the heads went on on small-blocks.
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That would explain a big-block stamping in this location:
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That explains the location of the pictured pad stamp, but the stamping itself, and broach marks, looks a little fishy.
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Rick
69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.)
69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan

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