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Old 04-29-2020, 12:34 PM
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Lee Stewart Lee Stewart is offline
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Ford rated the Boss 429 at 375 HP which unlike the 428 Cobra Jet was probably very close to the engine's given rating. Even with the standard 3.91 rear the Boss 429 Mustang developed a poor performance rating as a muscle car compared to others. This was probably due to the choice Ford made for the carb, a 715 CFM. If Ford had used the 780 CFM carb from the Boss 302 it's performance would have been a lot better.
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