headers vs manifolds on a 318 2bbl difference ????

As far as what these headers provided on this particular vehicle for bottom end torque, the 60 ft time was the same. It also felt the same off the line. The van has the factory super-tight torque converter in it, plus it's not as light as a Duster. But I can actually FEEL by the seat of the pants as the RPM's build that it is faster with the headers.