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1 3/4 headers vs 1 7/8 headers

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Old 09-07-2010, 09:59 PM
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Default 1 3/4 headers vs 1 7/8 headers

Are there any dyno sheets or track times proving that the 1 7/8 headers make more power WITHOUT a cam or heads done? I'm talking full bolt ons only. I think I saw a thread on here a few years ago showing the dyno results
Old 09-07-2010, 10:46 PM
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https://ls1tech.com/forums/generatio...o-results.html
Old 09-08-2010, 04:40 PM
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Maryland Speed describes it this way (about Kooks)

1 3/4"
"With a proper tune at a dyno shop, these headers are good for 20-35HP depending on the vehicle. The 1 3/4" design is great for cars with basic bolt on mods intended to make 400-450 rwhp!"

1 7/8"
"With a proper tune at a dyno shop, these headers are good for 20-35HP depending on the vehicle. The 1 7/8" design is great for cars with advanced bolt on mods, internal engine work, and forced induction or nitrous in the 450-650 rwhp range!"

Hope this helps a little...

Last edited by libertyforall1776; 09-13-2010 at 11:23 AM.
Old 09-08-2010, 06:40 PM
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What about with a 427? Is the 1 7/8" sufficient or will the full 2" be better?
Old 09-08-2010, 10:06 PM
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Originally Posted by scoby41
What about with a 427? Is the 1 7/8" sufficient or will the full 2" be better?
1 7/8 will be fine but if you want more then by all means go for it.
Old 09-09-2010, 12:37 PM
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Only Bolt ons full-------1 3/4
Old 09-10-2010, 04:32 PM
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I will have a dyno comparison next week Thursday of top brand headers...

from 1 3/4 qtps to

1 7/8 ARH with flowmaster merge & ewp...so we shall see, stay tuned
Old 09-10-2010, 04:36 PM
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Originally Posted by chrs1313
I will have a dyno comparison next week Thursday of top brand headers...

from 1 3/4 qtps to

1 7/8 ARH with flowmaster merge & ewp...so we shall see, stay tuned
Nice, what section are you gonna be putting it in?
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Old 09-10-2010, 05:33 PM
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if you do a search..
you will find that in general.. with no other changes...
you will have the same horsepower and torque down low, but your top end will extend to a higher rpm.

no "loss" of low end torque from 1-7/8 headers... if you have loss, then you have a shitty tuner.
Old 09-11-2010, 01:25 AM
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dyno results
Old 09-11-2010, 11:40 AM
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Originally Posted by chrs1313
dyno results
Where?
Old 09-12-2010, 08:34 AM
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Run a search for my user name. We engine dyno tested both sizes side by side when testing on a stock ls1!
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Old 09-12-2010, 10:57 AM
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Originally Posted by Jason 98 TA
Run a search for my user name. We engine dyno tested both sizes side by side when testing on a stock ls1!
this is very true if you are thinking of getting pacesetters 1 3/4 you are better off with the TSP 1 7/8s...better gains everywhere...

but the jury is still out how these TSP 1 7/8s will perform against one of the top 3 ARH, kooks, or QTP 1 3/4 headers...

I have yet to see a dyno that compares ARH, kooks, or qtp 1 3/4 to ARH, kooks, qtp 1 7/8s...

I won't have an a-b comparion but it is the best I can do...

from non mandrel bent y with qtp 1 3/4 to

mandrel bent y with flowmaster merge, ARH 1 7/8, and an EWP...

should have results on Thursday if everything goes as it should...

look in dyno results section...
Old 09-13-2010, 11:27 AM
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I would like to see that proof, not on an engine dyno, but on a full F-Body...


Originally Posted by soundengineer
if you do a search..
you will find that in general.. with no other changes...
you will have the same horsepower and torque down low, but your top end will extend to a higher rpm.

no "loss" of low end torque from 1-7/8 headers... if you have loss, then you have a shitty tuner.
Old 09-13-2010, 12:23 PM
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Originally Posted by libertyforall1776
I would like to see that proof, not on an engine dyno, but on a full F-Body...
In the quest for 500 horsepower on a previous vehicle of mine....
I switched from 1-3/4 kooks stainless to 1-7/8 kooks stainless...

Pulled it around lunch on the dyno... swapped the headers, and pulled again just 3 hours later.

My back to back lost nothing down low... line followed identical.
I gained power from about 4600 on up....
I got the 500 on a stock bottom end LS1
Old 09-13-2010, 01:00 PM
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Originally Posted by soundengineer
In the quest for 500 horsepower on a previous vehicle of mine....
I switched from 1-3/4 kooks stainless to 1-7/8 kooks stainless...

Pulled it around lunch on the dyno... swapped the headers, and pulled again just 3 hours later.

My back to back lost nothing down low... line followed identical.
I gained power from about 4600 on up....
I got the 500 on a stock bottom end LS1

that's what I like to hear how much more hp did I get you up top...also what setup did you have to hit 500rwhp...pm me if you don't want to post...thanks
Old 09-13-2010, 02:59 PM
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Originally Posted by chrs1313
that's what I like to hear how much more hp did I get you up top...also what setup did you have to hit 500rwhp...pm me if you don't want to post...thanks
Im Interested to know too

btw chrs1313 im looking forward to see ur results.

when will u finish the swap ?

Originally Posted by chrs1313
I will have a dyno comparison next week Thursday of top brand headers...

from 1 3/4 qtps to

1 7/8 ARH with flowmaster merge & ewp...so we shall see, stay tuned

which size flowmaster merge are u planing to install 3" or 4" out ?

Last edited by Engine_HP; 09-13-2010 at 03:17 PM.
Old 09-14-2010, 01:36 PM
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I like what I hear -- can you post pics of your before and after dyno charts? Also would love to know all your mods... Thanks!


Originally Posted by soundengineer
In the quest for 500 horsepower on a previous vehicle of mine....
I switched from 1-3/4 kooks stainless to 1-7/8 kooks stainless...

Pulled it around lunch on the dyno... swapped the headers, and pulled again just 3 hours later.

My back to back lost nothing down low... line followed identical.
I gained power from about 4600 on up....
I got the 500 on a stock bottom end LS1
Old 09-14-2010, 05:16 PM
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Originally Posted by Engine_HP
Im Interested to know too

btw chrs1313 im looking forward to see ur results.

when will u finish the swap ?

swap is done y pipe is finishing fab today...getting dynoed tom or Thursday


which size flowmaster merge are u planing to install 3" or 4" out ?
come on now which one do you think?

haha jk 4"
Old 09-14-2010, 05:55 PM
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Just got the results from my dyno run, 360rwhp/360rwtq using 1 7/8". Numbers down low don't look bad, but I don't have any numbers from the 1 3/4" headers.



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