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Old 02-06-2021, 10:58 AM
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unruhjonny unruhjonny is offline
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To add upon what has been said;
The 1970-1976 hoods all have additional curvature for the single round headlights;
For Trans Am's and base/Esprit models the hood interchange is 70-76.

Now it is worth noting that the 1976 Formula hood was actually a design used during the design/study phase on the 1970 Formula.
The 70-74 Formulas, if opted correctly could have a functional "ram air" setup via the hood as a factory option, but you could not have this as factory equipment for 1975. I suspect that the hood was changed for three reason's in 1976:
1) hood functionality no longer intended
2) different design would essentially refresh the look of the Formula
3) the refreshed 76 Formula hood would act as a transitional design to create model continuity for when the hoods required a redesign for 77.

All the hoods were changed in 1977 because the curvature/recess was removed when Firebirds adapted the quad headlamp confiiguration.
Once again, Trans Am's* and base/Esprit models interchange for 77-81;
The Formula hood now is 77-81*;
* = Both the Trans Am and Formula have one exception during this time, and that applies to 80/81 turbocharged 301 models, and for those cars, the Trans Am and Formula use the same hood, similar to how SD455 Formulas and Trans Am's used the same hood.

I hope this adds clarity to the subject.

__________________
1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)