mid length headers, an acceptable alternative?
mid length headers, an acceptable alternative? Long story short -
I'm putting a LS1 in a mustang
, the dynatech & kooks swap headers are overpriced, I work in a tube bending/fabrication shop and am considering building a prototype set of mid length headers for my swap.
My concern -
What am I giving up by running 1.75" mid lengths vs. 1.75" long tubes? The engine is a stock bore & stroke LS1, 243 heads, LS6 intake, the cam is likely to be the 224/228 on 114 from texas speed (may go to forced induction later).
Will I be sacrificing torque, top end hp, or ???? with the shorter headers? Any input appreciated!
I'm putting a LS1 in a mustang
, the dynatech & kooks swap headers are overpriced, I work in a tube bending/fabrication shop and am considering building a prototype set of mid length headers for my swap.My concern -
What am I giving up by running 1.75" mid lengths vs. 1.75" long tubes? The engine is a stock bore & stroke LS1, 243 heads, LS6 intake, the cam is likely to be the 224/228 on 114 from texas speed (may go to forced induction later).
Will I be sacrificing torque, top end hp, or ???? with the shorter headers? Any input appreciated!
You'll lost some top end power, but I think you'll make good mid range power and torque. I ran mac mid lengths back in the day on my 98 Z , it ran good, trapped 109 at the strip with those headers and intake only
I could but whatever I end up with I'll probably offer for sale to others doing this swap. Just thought the mid lengths are easier to install/remove, cheaper, ..... $600 for a set of long tubes (dynatechs) that aren't even ceramic coated isn't in everyones budget, I may be able to offer an alternative.
I've done some searches and found that there are a lot of satisfied Mac mid length users. Macs website sucks, any idea what size the primaries & collectors are on the Macs? Also, where do you buy them, I don't see them at summit or jegs.
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Staging Lane
Joined: Nov 2001
Posts: 89
Likes: 0
From: NJ
Ran the same setup on my 98 before the h/c package and I also was trapping 109mph in an m6 with only a lid. That was an increase of ~3mph from stock
Last edited by 98F-1camaro; Dec 12, 2011 at 12:05 PM.
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I bought mine from Speed Inc ten years ago. They're not on Speed Incs website anymore so I don't know if they still make em anymore. Bassani made LsX mids for our cars too, give them a try.
You'll lost some top end power, but I think you'll make good mid range power and torque.
Longer primaries tend to shift the power curve down and shorter primaries move it up.
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
"I think it's the other way around. You'll lose some low-mid range torque but make similar if not slightly more power up top."
That has been my experience with actually back to back dyno tests. Lost some torque down low and virtually no difference in horsepower above peak torque.
That has been my experience with actually back to back dyno tests. Lost some torque down low and virtually no difference in horsepower above peak torque.
"I think it's the other way around. You'll lose some low-mid range torque but make similar if not slightly more power up top."
That has been my experience with actually back to back dyno tests. Lost some torque down low and virtually no difference in horsepower above peak torque.
That has been my experience with actually back to back dyno tests. Lost some torque down low and virtually no difference in horsepower above peak torque.
Interesting, not really what I wanted to hear but I appreciate your input. Long tubes are starting to look unavoidable.
Next question, is there any advantage to making the primaries equal length if I build mid-length headers?