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Except it probably didn't.Ok true, so the 400 HP in 1970 ACTUALLY made 345HP.
In 1970, the engine was rated at 400 gross hp. In 1971, the compression ratio was reduced from 10:1 to 8.5:1, resulting in the gross rating being lowered to 365hp. However, net ratings were also used this year and the 500 was listed as 235hp, from there the power output crept down to 190hp over the next few years.