1 7/8 headers on stock 346...
Thread Starter
TECH Regular
Joined: May 2002
Posts: 434
Likes: 0
From: Lubbock
1 7/8 headers on stock 346... I have a 2000 Z28 with minor exhaust (Borla) and intake (Whisper lid, free ram air) mods. I will be getting heads/cam/stroker later but not now for financial reasons. So I'm building the exhaust system first. Are 1 7/8s headers too much for an almost stock application stock application??? What kinds of hp/tq and 1/4 mile gains will I see with these headers?
Re: 1 7/8 headers on stock 346... 1 7/8 ARE TOO BIG FOR STOCK, IF YOUR SERIOUS ABOUT BUILDING A REAL MOTOR I'D GET THE BIG HEADERS AND DEAL WILL THE LOSS IN POWER VS USING A 1 3/4 HEADER NOW
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAGENZ28:
<strong>1 7/8 ARE TOO BIG FOR STOCK, IF YOUR SERIOUS ABOUT BUILDING A REAL MOTOR I'D GET THE BIG HEADERS AND DEAL WILL THE LOSS IN POWER VS USING A 1 3/4 HEADER NOW</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I GREATLY dissagree with this comment! <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
Everyone says that but i have the 1-7/8 LT's on my STOCK LS1. I gained 20 hp and gains started @ 3500 rpm. Torque was up on my complete rpm the least amount was 5ft/lbs up to 15ft/lbs with NO LOSS ANYWHERE. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Don't mean to sound like a ***** but people ALWAYS say they are to big and have no proof to back it up! I DO! <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
Possibly on other V8's that is true but LS1's like to BREATH! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong>1 7/8 ARE TOO BIG FOR STOCK, IF YOUR SERIOUS ABOUT BUILDING A REAL MOTOR I'D GET THE BIG HEADERS AND DEAL WILL THE LOSS IN POWER VS USING A 1 3/4 HEADER NOW</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I GREATLY dissagree with this comment! <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
Everyone says that but i have the 1-7/8 LT's on my STOCK LS1. I gained 20 hp and gains started @ 3500 rpm. Torque was up on my complete rpm the least amount was 5ft/lbs up to 15ft/lbs with NO LOSS ANYWHERE. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Don't mean to sound like a ***** but people ALWAYS say they are to big and have no proof to back it up! I DO! <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
Possibly on other V8's that is true but LS1's like to BREATH! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Trending Topics
Re: 1 7/8 headers on stock 346... My car was still running rich w/ 20hp. There was much more potential but dyno runs get expensive. ESPECIALLY w/ only MAFT to tune with. There is more in her since i was in the low 12's w/ my A/F ratio...
<small>[ June 29, 2002, 09:31 PM: Message edited by: guadofreak ]</small>
<small>[ June 29, 2002, 09:31 PM: Message edited by: guadofreak ]</small>
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 Thread Starter
TECH Regular
Joined: May 2002
Posts: 434
Likes: 0
From: Lubbock
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAGENZ28:
<strong>IVE TALKED TO PEOPLE WITH MILD LS1 AND THE 1 3/4- 1 7/8 STEPPED MADE LESS POWER ON THE DYNO IN THERE CARS</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not talking about stepped headers. 1 7/8s Grotts...
<strong>IVE TALKED TO PEOPLE WITH MILD LS1 AND THE 1 3/4- 1 7/8 STEPPED MADE LESS POWER ON THE DYNO IN THERE CARS</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not talking about stepped headers. 1 7/8s Grotts...
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: 1 7/8 headers on stock 346... I've got the 1-7/8 Grots as well on a stock 346. After adding the Grots, the y-pipe with cats and the Corsa exhaust I netted a 45 HP gain. Maybe the numbers would be slightly different with the 1 3/4, but I really didn't mind it.
Stock Dyno Graph
New Exhaust Dyno Graph
Stock Dyno Graph
New Exhaust Dyno Graph
Re: 1 7/8 headers on stock 346... I've ran 1 7/8" (Whisper) headers on my Stock Internals car for over a year. Could care less about the dyno numbers.. my track number don't lie <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> See sig <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by WILWAXU:
<strong>I've ran 1 7/8" (Whisper) headers on my Stock Internals car for over a year. Could care less about the dyno numbers.. my track number don't lie <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> See sig <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Glad to see you supporting the cause John! <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />
BTW- When ya gonna be down again? <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
<strong>I've ran 1 7/8" (Whisper) headers on my Stock Internals car for over a year. Could care less about the dyno numbers.. my track number don't lie <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> See sig <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Glad to see you supporting the cause John! <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />
BTW- When ya gonna be down again? <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
Thread Starter
TECH Regular
Joined: May 2002
Posts: 434
Likes: 0
From: Lubbock
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by derty:
<strong>I've got the 1-7/8 Grots as well on a stock 346. After adding the Grots, the y-pipe with cats and the Corsa exhaust I netted a 45 HP gain. Maybe the numbers would be slightly different with the 1 3/4, but I really didn't mind it.
Stock Dyno Graph
New Exhaust Dyno Graph</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">WOW!
<small>[ July 01, 2002, 01:26 AM: Message edited by: 2000LS1 ]</small>
<strong>I've got the 1-7/8 Grots as well on a stock 346. After adding the Grots, the y-pipe with cats and the Corsa exhaust I netted a 45 HP gain. Maybe the numbers would be slightly different with the 1 3/4, but I really didn't mind it.
Stock Dyno Graph
New Exhaust Dyno Graph</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">WOW!
<small>[ July 01, 2002, 01:26 AM: Message edited by: 2000LS1 ]</small>
TECH Junkie
Joined: Jan 2002
Posts: 3,015
Likes: 0
From: At the office
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAGENZ28:
<strong>1 7/8 ARE TOO BIG FOR STOCK, IF YOUR SERIOUS ABOUT BUILDING A REAL MOTOR I'D GET THE BIG HEADERS AND DEAL WILL THE LOSS IN POWER VS USING A 1 3/4 HEADER NOW</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Bullshit on that one. I'm putting down 370rwhp/380rwtq WITH JUST BOLT ONS...and I'm doing it through a 33 spline 12 bolt and 3.73 gears.
And yes I do have the Grotts. Power loss my ***. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />
<strong>1 7/8 ARE TOO BIG FOR STOCK, IF YOUR SERIOUS ABOUT BUILDING A REAL MOTOR I'D GET THE BIG HEADERS AND DEAL WILL THE LOSS IN POWER VS USING A 1 3/4 HEADER NOW</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Bullshit on that one. I'm putting down 370rwhp/380rwtq WITH JUST BOLT ONS...and I'm doing it through a 33 spline 12 bolt and 3.73 gears.
And yes I do have the Grotts. Power loss my ***. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />
Re: 1 7/8 headers on stock 346... I RAN 10.60@127 WITH A 1 3/4 HEADER, SIZE DOESN'T MEAN YOU GAIN 10000000000 HP JUST CAUSE THERE BIGGER, THERES MORE THAN JUST PRIMARYS OF AN EXHAUST
TECH Junkie
Joined: Jan 2002
Posts: 3,015
Likes: 0
From: At the office
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by TrahnZam WS6:
<strong>[
Verbs: what size grots do you have just for clarification?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">1 7/8 <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" />
<strong>[
Verbs: what size grots do you have just for clarification?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">1 7/8 <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" />
TECH Enthusiast
Joined: Nov 2001
Posts: 623
Likes: 0
From: Houston / Dallas
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAGENZ28:
<strong>I RAN 10.60@127 WITH A 1 3/4 HEADER, SIZE DOESN'T MEAN YOU GAIN 10000000000 HP JUST CAUSE THERE BIGGER, THERES MORE THAN JUST PRIMARYS OF AN EXHAUST</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Isn't nitrous great? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Turn off your damn capslock please.
Verbs: what size grots do you have just for clarification?
I gained 28 rwhp and 26 rwtq with the 1 3/4 grots, and a friend gained 33 rwhp and 26 rwtq, both gains were made on a stock LS1. The fastest bolt-on LS1 uses the 1 3/4s as well. IMO the 1 7/8 will still net a great gain, but maybe the 1 3/4s will work slightly better on stock cubes.
<strong>I RAN 10.60@127 WITH A 1 3/4 HEADER, SIZE DOESN'T MEAN YOU GAIN 10000000000 HP JUST CAUSE THERE BIGGER, THERES MORE THAN JUST PRIMARYS OF AN EXHAUST</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Isn't nitrous great? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Turn off your damn capslock please.
Verbs: what size grots do you have just for clarification?
I gained 28 rwhp and 26 rwtq with the 1 3/4 grots, and a friend gained 33 rwhp and 26 rwtq, both gains were made on a stock LS1. The fastest bolt-on LS1 uses the 1 3/4s as well. IMO the 1 7/8 will still net a great gain, but maybe the 1 3/4s will work slightly better on stock cubes.
Thread Starter
TECH Regular
Joined: May 2002
Posts: 434
Likes: 0
From: Lubbock
Re: 1 7/8 headers on stock 346... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by guadofreak:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAGENZ28:
<strong>1 7/8 ARE TOO BIG FOR STOCK, IF YOUR SERIOUS ABOUT BUILDING A REAL MOTOR I'D GET THE BIG HEADERS AND DEAL WILL THE LOSS IN POWER VS USING A 1 3/4 HEADER NOW</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I GREATLY dissagree with this comment! <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
Everyone says that but i have the 1-7/8 LT's on my STOCK LS1. I gained 20 hp and gains started @ 3500 rpm. Torque was up on my complete rpm the least amount was 5ft/lbs up to 15ft/lbs with NO LOSS ANYWHERE. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Don't mean to sound like a ***** but people ALWAYS say they are to big and have no proof to back it up! I DO! <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
Possibly on other V8's that is true but LS1's like to BREATH! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">guadofreak... what exhaust setup do you have after the headers?
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAGENZ28:
<strong>1 7/8 ARE TOO BIG FOR STOCK, IF YOUR SERIOUS ABOUT BUILDING A REAL MOTOR I'D GET THE BIG HEADERS AND DEAL WILL THE LOSS IN POWER VS USING A 1 3/4 HEADER NOW</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I GREATLY dissagree with this comment! <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
Everyone says that but i have the 1-7/8 LT's on my STOCK LS1. I gained 20 hp and gains started @ 3500 rpm. Torque was up on my complete rpm the least amount was 5ft/lbs up to 15ft/lbs with NO LOSS ANYWHERE. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Don't mean to sound like a ***** but people ALWAYS say they are to big and have no proof to back it up! I DO! <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
Possibly on other V8's that is true but LS1's like to BREATH! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">guadofreak... what exhaust setup do you have after the headers?
Re: 1 7/8 headers on stock 346... I have the GMMG w/ OR Ypipe. There is stil more power in the car i just need to lean it out some more. My ultimate plans are big cubes so i just started w/ the best! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Gains are there and i was dynoed on a crappy day. Either way i have nothing to justify. I was NOT saying that they were better or superior <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> to the 1-3/4 grotts. I was merely stating a fact that they are NOT to big. Some people just get there panties in a wad when it does not concern them. <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
Well off to wash my newest beater car... <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Gains are there and i was dynoed on a crappy day. Either way i have nothing to justify. I was NOT saying that they were better or superior <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> to the 1-3/4 grotts. I was merely stating a fact that they are NOT to big. Some people just get there panties in a wad when it does not concern them. <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
Well off to wash my newest beater car... <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Thread Starter
TECH Regular
Joined: May 2002
Posts: 434
Likes: 0
From: Lubbock
Re: 1 7/8 headers on stock 346... Well I'm thinkin these with 3" duals including cutouts, cats, bullets, and turndowns before the axle. Would that be too big and create backpressure by slowing exhaust flow???