LT4 specific? EGR block-off, need help
Thread Starter
Racer
Joined: Aug 2005
Posts: 385
Likes: 0
From: Apopka Florida
LT4 specific? EGR block-off, need help
Im currently shopping for headers and have a ton of posts about brands, installs, coatings, and misfortunes. I am currently leaning toward Stainless Works, but need to clarify few things before I make my purchase. I want to remove my egr, which means I can purchase headers without the egr hook-up, but am unclear of the process.
Will TPI longtubes fit on my LT4? Different Heads mean different things, but I have heard that they will fit, is this true? and with how much modification?
With the egr removed I don't need the EGR hook-ups but do I need two 02 bungs on each side? I am unclear of how my emission hook-ups work, but I would like to be able to get rid the egr escpecially.
Will TPI longtubes fit on my LT4? Different Heads mean different things, but I have heard that they will fit, is this true? and with how much modification?
With the egr removed I don't need the EGR hook-ups but do I need two 02 bungs on each side? I am unclear of how my emission hook-ups work, but I would like to be able to get rid the egr escpecially.
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
You have a LT4 ,it has no EGR.
I went with Stahl headers,way to expensive for what they are.I would check on the form and see if anyone in the (parts for sale) section has some ,I saw a couple pairs their days ago.
Make sure you atleast use the felpro 1406 gaskets ,I use the 1407 and they just fit the ports.
You also have 3 o2 sensors and one is in the exaust pipe ,the other 2 will need to be installed into the headers if you buy long tube.
I went with Stahl headers,way to expensive for what they are.I would check on the form and see if anyone in the (parts for sale) section has some ,I saw a couple pairs their days ago.
Make sure you atleast use the felpro 1406 gaskets ,I use the 1407 and they just fit the ports.
You also have 3 o2 sensors and one is in the exaust pipe ,the other 2 will need to be installed into the headers if you buy long tube.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Originally Posted by REDC4CORVETTE
You have a LT4 ,it has no EGR.
Originally Posted by REDC4CORVETTE
You also have 3 o2 sensors and one is in the exaust pipe ,the other 2 will need to be installed into the headers if you buy long tube.
Drifting
Joined: Mar 2004
Posts: 1,522
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I have a 96 LT4, as does my best friend, and his has EGR and mine doesn't. Mine already had an aftermarket headers installed (hooker super comp) when I got the car, and came from a county in Texas that did not require emission checks, (but it still passes fine in a check county now unchanged, without egr). My best friends came from Cali, and his engine was rebuilt.
So, neither is stock, but one has it, and one doesn't. I've seen pictures on here of other LT4's with EGR, and some without.
Your care will have 4 o2 sensors. One in each of the headers, to check the tune (A/F ratio), and one on each side after the cats to check that they are working (that's all they do).
So, neither is stock, but one has it, and one doesn't. I've seen pictures on here of other LT4's with EGR, and some without.
Your care will have 4 o2 sensors. One in each of the headers, to check the tune (A/F ratio), and one on each side after the cats to check that they are working (that's all they do).
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Cold_B
I have a 96 LT4, as does my best friend, and his has EGR and mine doesn't. Mine already had an aftermarket headers installed (hooker super comp) when I got the car, and came from a county in Texas that did not require emission checks, (but it still passes fine in a check county now unchanged, without egr). My best friends came from Cali, and his engine was rebuilt.
So, neither is stock, but one has it, and one doesn't. I've seen pictures on here of other LT4's with EGR, and some without.
Your car will have 4 O2 sensors. One in each of the headers, to check the tune (A/F ratio), and one on each side after the cats to check that they are working (that's all they do).
So, neither is stock, but one has it, and one doesn't. I've seen pictures on here of other LT4's with EGR, and some without.
Your car will have 4 O2 sensors. One in each of the headers, to check the tune (A/F ratio), and one on each side after the cats to check that they are working (that's all they do).
Pro
Joined: Jan 2004
Posts: 626
Likes: 2
From: Nashville
Originally Posted by Corvette Kid NC
No LT4 has EGR. Whay you and the original poster are confusing w/ EGR is AIR which all C4s have in one form or another. Any LTx specific header will have O2 bungs in the collectors and should have the rear one or ones in the extension pipes if you get the whole kit. Stainless Works has everything you need, check them out.
The AIR fittings are the ones on the headers. If you take this off you will have a SES light. The AIR helps the cats heat up faster they are only "on" when you first start the car.
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 2
From: Cincinnati Oh
A long tube header post and no one mentioned Exotic Muscle??? What's wrong with you guys. 
I would highly recommend Exotic Muscle, I have installed them on two vettes, both LT4s. I love them on my LT4. TPIS are also good from what I hear.
Oh, and the LT4s do not have egr
I would highly recommend Exotic Muscle, I have installed them on two vettes, both LT4s. I love them on my LT4. TPIS are also good from what I hear.Oh, and the LT4s do not have egr
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by all4c4lt4
A long tube header post and no one mentioned Exotic Muscle??? What's wrong with you guys. I would highly recommend Exotic Muscle, I have installed them on two vettes, both LT4s. I love them on my LT4. TPIS are also good from what I hear.
Oh, and the LT4s do not have egr
I would highly recommend Exotic Muscle, I have installed them on two vettes, both LT4s. I love them on my LT4. TPIS are also good from what I hear.Oh, and the LT4s do not have egr
I've been curious just what is fitted to LT4 engines. They do not take EGR into the intake manifold, but do they have more or less the same pipes as the LT1?
My mission this year is to look under the hood of a couple of unmolested LT4 cars and verify what is there on the passenger side of the exhaust.
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Thread Starter
Racer
Joined: Aug 2005
Posts: 385
Likes: 0
From: Apopka Florida
So is there some way to remove the AIR system? It taps into the headers on both passenger and driver side. It just seems that if I'm going to put the longtubes on I might as well take it off.
Are TPI motor longtubes the same as mine, just without the 02 hook ups?
Are TPI motor longtubes the same as mine, just without the 02 hook ups?
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by 96Eric
So is there some way to remove the AIR system? It taps into the headers on both passenger and driver side. It just seems that if I'm going to put the longtubes on I might as well take it off.
Are TPI motor longtubes the same as mine, just without the 02 hook ups?
Are TPI motor longtubes the same as mine, just without the 02 hook ups?
If you buy TPIS or EM headers you will have the O2 bungs in place on the header collectors. TPI headers likely won't have the right O2 bungs. Unless you get a heck of a bargain used you should not try TPI headers, stick with the models made for your engine.
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
I don't know about a '96 but my '95 has never thrown a code w/ the AIR off. It's been off for a couple of years.
Race Director
Joined: Apr 2000
Posts: 15,344
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From: Texas
Originally Posted by Corvette Kid NC
I don't know about a '96 but my '95 has never thrown a code w/ the AIR off. It's been off for a couple of years.