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I have to admit...they are very good looking in Orbit...even if they are slugs...even that crappy RA IV is kind of weak.....
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Pontiac Engineers stated there was no need to create a RAIV 455 in 1970. The 400 RAIV was sufficient.
The 68-1/2 RAII Firebird and the 69 RAIV Firebird were Pontiac's peak cars in the Musclecar Era. They were lighter than the GTO, and better looking than the Camaro.