Thread: Photo's of a 77 W72 Vacuum Lines
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Old 03-20-2020, 10:59 PM
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They just mean manifold vs. ported vacuum on the carb. (lower, on baseplate, is manifold). Here is a '76 diagram which should be close to the '77.
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Click image for larger version Name: 1976FirebirdSheet6Y3-1.1.jpg Views: 4308 Size: 84.2 KB ID: 534894  

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