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

 

https://ls1tech.com/forums/generatio...o-results.html

 

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...

 

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.

 

Only Bolt ons full-------1 3/4

 

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?

 

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.

 

dyno results

 

Where?

 

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...

 

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

 

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 ?


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

 

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!

 

come on now which one do you think?

haha jk 4"

 

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.