1968 Mopar Street-Race ~ Road Runner 383 vs. GTX 440
Nick - Nack
1968 had '3' different Horsepower Ratings for the 4-Barrel Engines.
383/300 HP ........ Plymouth Barracuda and Dodge Dart GTS
383/330 HP ........ Plymouth and Dodge 'B-Body' and Big-Body cars.
383/335 HP ........ Plymouth Road Runner and Dodge Super Bee 'only'
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Closer related {True} Horsepower Output
383/300 HP ....... 277 HP
383/330 HP ....... 283 HP
383/335 HP ....... 305 HP