I've got a '71 RR with a 383 and 44000 orig Miles. I rebuilt the #s 383 and stroked it to 432. With stock heads and only a intake manifold change, it made 430 horsepower and 470 torque.
The only thing I would change is using the 4.250" stroke crank and go for 496 cubes. All sleeper.


1972 Plymouth Cuda 340 4 speed 1971 Plymouth Road Runner 383 Auto 1970 Plymouth Duster /6 Auto