1967 ~ Barracuda 383-S and Dart GTS-383 ~ 280 HP 'How can this be.'

The heads used on the 383 in those years although a closed chamber style design had a small exhaust valve, this also contributed to the lower 280HP rating along with small AFB carb, cam, low efficiency intake/exhaust design . Actually and I could be wrong... I believe the Dart and Barracuda did not have the HP stamped motors installed, just plain 4 Barrel carbed engines. My 67 383 auto car does not have a HP stamping. Very straight forward approach, I guess Chrysler was in a hurry to get these cars out the door. 1/2 year, mid year availability also says a lot on the development. In later years the cars and the engines became more refined.