Q: What is the horsepower rating on a 1973 Pontiac Firebird?

The 1973 Pontiac Firebird: The 350 V8 150-hp; Formula 400 V8 250-hp; 455, available in the Formula and Trans Am, hit 300-hp. But the new SD-455 got closer to 370-hp and could be easily modified to reach even higher numbers. !

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