What was the difference between the 440 exhaust manifolds and the 383?
Here's the heart of the question...
Weren't the 440 cars rated at 375 horse the same as the B body 440HP?
If the A body 383 was de-rated due to restrictive exhaust manifolds, why did Chrysler not use the 440 manifolds, which do not appear to be restrictive, on the 383 cars?
thanks