BUT there is a difference. There is a misconception that the header benefit comes exclusively from lack of flow restriction. That isn't necessarily so. The separation of pulses by the long tube header is very important and contributes to the long tube header's superiority below the torque peak. This was pointed out a few years ago by the tests referred to above. Look at the torque progression at low speeds. The longer the separation between ports, the greater the benefit, is how I categorize the results. of course, the word "longer" is within reason, I'm not pushing 120" long primaries!

R.

PS: This article and test was done by Steve Dulcich, a board member. Reading his article again, I find I'm restating much of what he said. Thanks, Steve!

back when i first bought my 69/383 dart,i threw out the rusty headers,and used a C body on the left,and a 68-69 "900" on the right. my exhaust guy in town used a 2" to hook the lh to the 2.25 pipe,and worked great. he bent it around the t-bar,and missed all the 4spd stuff. that was in 1984,and the car still has all the exhaust on it still...the correct manifolds were unabtainable in my stupid little town,lol

I'm not really sure the value of these results at such low flows. And the Dp will increase exponentially with the flow.