The Pontiac Firebird Formula is a trim level ... the 1970 Formula 400 came standard with a 400 cubic-inch, 330-horsepower V8, while the optional 345-horsepower Ram Air III V8 engine (standard ...

However, the addition of Ram Air increased the maximum rpm from 4,800 to 5,200. Photo: eBay seller donmcmi_29 The 1967 Firebird in this photo is described as "an original 400 Firebird." ...

Some five months later, Pontiac jumped on the bandwagon with the Firebird ... The Trans Am came standard with the 400-cubic-inch (6.6-liter) L74 Ram Air III V8, rated at 335 horsepower.