1 7/8 headers
1 7/8 headers I have a ls2 402 block and I'm trying to maximize my setup, also down the road I would like to throw a 150 shot through it. The problem is I am trying to decide whether or not it is worth switching my 1 3/4 kooks headers for 1 7/8 kooks headers. I have already found somebody to buy my old headers so the cost will be minimal. Does anyone know what kind of performance gains I would get from doing this switch.
If you are going with 1 7/8 id recommend getting an aftermarked K member. I didnt and now I get lots of banging and hwen I got tuned my tuner had to basically turn off my knock sensors cause I was getting all kinds of false knock. That or notch the stock k member a lot.
go with 1 7/8-2inch and an aftermarket k-member.
All these people talking about losing low end.. not on a big CI motor.
I just switched from 1 3/4 to 1 7/8-2inch and the power increase is amazing.
All these people talking about losing low end.. not on a big CI motor.
I just switched from 1 3/4 to 1 7/8-2inch and the power increase is amazing.
Originally Posted by gman
So basically the only way I could run the 1 7/8 headers is with a aftermarket k-member. I didn't realize there was clearance issues with these.
Not true at all. You can run them with stock k-member. You might have to trim some. With the 1 7/8-2in, i had clearance issues though.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
I've posted it many times... going from 1 3/4 to 1 7/8 on my 408, I lost about 20rwtq. didn't gain any hp till after 5000rpms. gained about 5 peak and it carried my hp out about another 500rpm over the 1 3/4. I didn't see any gain at the track.
Originally Posted by 383ss
I've posted it many times... going from 1 3/4 to 1 7/8 on my 408, I lost about 20rwtq. didn't gain any hp till after 5000rpms. gained about 5 peak and it carried my hp out about another 500rpm over the 1 3/4. I didn't see any gain at the track.
the 1 3/4 vs 1 7/8 is a very debated issue.i would say keep the 1 3/4 if you don't plan on spraying over a 150 shot.i've seen a few n2o tests where the 1 7/8 picked up quite a few hp,tq but i think it was on a pretty big hit so the 1 3/4 was a slight restriction.the combo you are using also makes a difference also.
383ss, Dude you have a 408ci monster do you really care about 20rwtq when you have 515rwtq? Is the 552rwhp because you have 1 7/8s not 1 3/4s? Sounds like a good deal to me cause I can't tell the diff between 515rwtq and 535rwtq can you? I mean its not like these cars are lacking in TQ now is it! My advice is go for the 1 7/8s cause they must sound killer 
I have heard big exhaust systems on other v8s and they always sound good so for 20rwtq I will take the sound and hp any day. Like some body said earlier get a K member if you need one and save yourself 30 pounds.
I have heard big exhaust systems on other v8s and they always sound good so for 20rwtq I will take the sound and hp any day. Like some body said earlier get a K member if you need one and save yourself 30 pounds. Last edited by Z28XTC; Jul 10, 2006 at 03:26 PM.
Originally Posted by Z28XTC
383ss, Dude you have a 408ci monster do you really care about 20rwtq when you have 515rwtq? Is the 552rwhp because you have 1 7/8s not 1 3/4s? Sounds like a good deal to me cause I can't tell the diff between 515rwtq and 535rwtq can you? I mean its not like these cars are lacking in TQ now is it! My advice is go for the 1 7/8s cause they must sound killer I have heard big exhaust systems on other v8s and they always sound good so for 20rwtq I will take the sound and hp any day. Like some body said earlier get a K member if you need one and save yourself 30 pounds.
I have heard big exhaust systems on other v8s and they always sound good so for 20rwtq I will take the sound and hp any day. Like some body said earlier get a K member if you need one and save yourself 30 pounds.
I must say on N20 I made huge numbers with these headers. went from 550rwhp to 680rwhp on a 100shot TNT.
I run QTP 1-7/8's heads on my LS2 402. Haven't dyno'd yet, but there is no lack of low end with my setup and the sound is pretty killer (screams at WOT). I have an audio at idle in my sig.
Originally Posted by gman
I have a ls2 402 block and I'm trying to maximize my setup, also down the road I would like to throw a 150 shot through it. The problem is I am trying to decide whether or not it is worth switching my 1 3/4 kooks headers for 1 7/8 kooks headers. I have already found somebody to buy my old headers so the cost will be minimal. Does anyone know what kind of performance gains I would get from doing this switch.
Also, I heard that LG may be coming out with an f-body header. It might be worth waiting to see how this header works. Their Corvette headers are awesome.
Originally Posted by TheBlurLS1
I've also seen lots of people with 1-7/8's and stock k-member with no problems. I'll be installing a set maby next weekend and plan on taking lots of pictures.
not a problem here