The massive 440 RB was produced from 1966 until 1978, making it the last of the Chrysler big-blocks. From 1966 to 1971, it was conservatively rated at 375 hp (280 kW) with a single four barrel and from 1969 to 1971, 390 hp (291 kW) with three two barrels. Both motors could produce 425 to 435 hp (317 to 324 kW). The 440 was known as the Magnum in Dodges, the Super Commando in Plymouths and briefly as the TNT in Chryslers.
