67-69 Plymouth Barracuda Wheel Opening Moldings

famous bob said

"Not" w/ the 383/330 horse roadrunner engine . The only reason it wasn`t rated at 335 horse like the roadrunner, was the pinched exhaust manifold on the drivers side. It even had paper work that stated that. I don`t remember where I read that there were very few, w/ the 330 horse engine, most 383 FORM S cars were 300 horse.

Click to expand...

The 383 motor was available in A/body Darts and Barracudas from 1967-1969.

Each year the horsepower rating changed on the motor. So it can get confusing. And people have wrote incorrect information which perpetuates the confusion.

This was written by big-block-dave that explains the motor differences:
******
...As for the 383's hp it goes like this:

In 67 the 383 in the Darts and Cuda's had the small exh valve (1.60) heads and the restictive exh manifolds along with a small 383 cam and the hp was 280.

In 68 the A-body 383 got the 906 heads with the larger (1.74) exh valves and the hp was raised to 300 hp.

In 1969 the A-body 383 got the larger 383 Roadrunner-SuperBee cam and the hp was raised to 330. The Roadrunner 383 was 335 because it had better flowing exh manifolds then the A-body 383.
*****

Factory repair manuals and dealer brochures and original owner cars back this information up.

Also info here: The First 1967 383 A-Body, 'Barracuda or Mr. Norms's Dart'