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Pontiac Sunbird Formula
The Sunbird was the typical hatchback-type GM compact of the ‘70s. It was almost identical to the Buick Skylark and Chevrolet Monza. However, in the Pontiac version, the Sunbird had an interesting muscle version they called the Formula with an optional V8 under the hood.
Pontiac borrowed the name, Formula from the Firebird line. The name always marked a model they equipped with a V8 engine. If you chose the Formula, you could get a 305 V8 engine with 165 HP and a hint of performance. Since the Sunbird was relatively light, you could call this Pontiac a muscle car, but just barely.