identify this hood:
I have all that info too. Cool stuff. Just because it was published in factory lit or assembly manuals doesn't tell 100% how the cars came off the assembly line. It certainly tells most of the story, though.
Changes to 1972 Cutlass hood
The '72 Cutlasses built after 12/31/1971 had the new seat belt system and elimination of the rear vents on the hood. The hood change applied to AC and non-AC cars.
Changes to 1972 Cutlass hood
Here's some info from the 1972 OLDSMOBILE engineering report that provides some of the details direct from Lansing. Also included the diagram for the 71/72 W29 clearly showing the rear venting. I'm going with the documentation.
The '72 Cutlasses built after 12/31/1971 had the new seat belt system and elimination of the rear vents on the hood. The hood change applied to AC and non-AC cars.


The '72 Cutlasses built after 12/31/1971 had the new seat belt system and elimination of the rear vents on the hood. The hood change applied to AC and non-AC cars.


I think if you look up the hood applications you will find:
1971 - has rear vents for both AC and non AC cars
1972 - has rear vents for non AC, but no vents on AC cars.
This drawing is copied and cropped from my 1972 Assembly Manual for your reference. That note is NOT provided in the 1971 Cutlass Assembly Manual
Last edited by Allan R; Apr 14, 2013 at 08:00 PM. Reason: add info
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