1971 340's True HP?

69 Cuda 440 said

Yes I would.

Carter BBD-4721S {M/T}
Carter BBD-4722S {A/T}

Primary ........ 1 7/16" {1.437"} ...... Venturi > 1 3/16" {1.186"}

Flow Rating .......... 285 CFM's

Without a doubt, the biggest 'draw-back' on the 318.

Click to expand...

I would argue that the single exhaust is the biggest restriction on them, then the carb...

The performance increase on my 70 318 swinger increased greatly when I had a 2 1/4" dual exhaust with an h-pipe installed, even with a 2 bbl it ran much better...

But putting a dual exhaust and upgrading to a 4 bbl will really wake up a 318...