It's a good upgrade to your car.
Recommended intake
Drifting
Joined: Mar 2013
Posts: 1,496
Likes: 353
From: Little Rock Arkansas
Yeah where are you reading that an LS6 intake won't fit? Because it will. Will it fit as-is? No. You'll still have to do a few mods, but it will eventually bolt up.
An affordable option is the Dorman 615-900 "LS6 style" intake. It situates itself right in between the LS1 and LS6 intakes as far as power gains and can often be had new for the same price as a used LS6 intake.
Other than that you're getting into either sheet metal intakes, or if you're willing to pay a lot more composite upgrade intakes.
An affordable option is the Dorman 615-900 "LS6 style" intake. It situates itself right in between the LS1 and LS6 intakes as far as power gains and can often be had new for the same price as a used LS6 intake.
Other than that you're getting into either sheet metal intakes, or if you're willing to pay a lot more composite upgrade intakes.
Thread Starter
Heel & Toe
Joined: Feb 2016
Posts: 24
Likes: 0
What exactly would I have to do to make it fit/work.. New to the corvette world lol so I don't really know much about these engines
Yeah where are you reading that an LS6 intake won't fit? Because it will. Will it fit as-is? No. You'll still have to do a few mods, but it will eventually bolt up.
An affordable option is the Dorman 615-900 "LS6 style" intake. It situates itself right in between the LS1 and LS6 intakes as far as power gains and can often be had new for the same price as a used LS6 intake.
Other than that you're getting into either sheet metal intakes, or if you're willing to pay a lot more composite upgrade intakes.
An affordable option is the Dorman 615-900 "LS6 style" intake. It situates itself right in between the LS1 and LS6 intakes as far as power gains and can often be had new for the same price as a used LS6 intake.
Other than that you're getting into either sheet metal intakes, or if you're willing to pay a lot more composite upgrade intakes.
Melting Slicks
Joined: Feb 2009
Posts: 2,857
Likes: 234
From: SW Nuh Hampsha
2018 C5 of Year Finalist
The LS6 manifold will fit fine, but you need to do one of two things:
1. Use the LS6 steam (?) pipes, or
2. Snap off a few ribs on the underside of the LS6 manifold in order to clear the LS1 pipes.
I did the latter and all worked perfectly.
A search will get you plenty of pix and instrux.
1. Use the LS6 steam (?) pipes, or
2. Snap off a few ribs on the underside of the LS6 manifold in order to clear the LS1 pipes.
I did the latter and all worked perfectly.
A search will get you plenty of pix and instrux.
Last edited by c5vetteguy; Jun 23, 2016 at 03:44 PM.
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From: PALM COAST Flordia
The LS6 manifold will fit fine, but you need to do one of two things:
1. Use the LS6 steam (?) pipes, or
2. Snap off a few ribs on the underside of the LS6 manifold in order to clear the LS1 pipes.
I did the latter and all worked perfectly.
A search will get you plenty of pix and instrux.
1. Use the LS6 steam (?) pipes, or
2. Snap off a few ribs on the underside of the LS6 manifold in order to clear the LS1 pipes.
I did the latter and all worked perfectly.
A search will get you plenty of pix and instrux.
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Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The STEAM VENT PIPING under the early LS1 manifolds will contact the underside of the LS6 / 2001-2004 LS-1 manifold. IMHO,,,,,,,,,, All I do to rectify this issue is I BEND the small piping down so the piping is LOWER than the fastener heads that secure the VALVE VALLEY COVER to the engine. The piping is easy to manipulate and bend out of the way. Just be careful not to KINK IT!
OR
You can rip out the early LS1 piping and install the 2001-2004 LS rear blanking plugs and the 2001-2004 LS front crossover tube piping.
I personally would just modify the piping that is already installed. EASY AS PIE!
The manifold then just bolts on! The only real difference is the added "improve plenum volume" inside the LS6 / 2001-2004 style manifold. The added volume is what lowers the BOTTOM of the manifold and that's what contacts the steam crossover piping.
Bill
Bill
OR
You can rip out the early LS1 piping and install the 2001-2004 LS rear blanking plugs and the 2001-2004 LS front crossover tube piping.
I personally would just modify the piping that is already installed. EASY AS PIE!
The manifold then just bolts on! The only real difference is the added "improve plenum volume" inside the LS6 / 2001-2004 style manifold. The added volume is what lowers the BOTTOM of the manifold and that's what contacts the steam crossover piping.
Bill
Bill
Last edited by Bill Curlee; Jun 24, 2016 at 11:24 AM.
Thread Starter
Heel & Toe
Joined: Feb 2016
Posts: 24
Likes: 0
Man you guys make it sound so easy lol, I'm new to all this so I'll have to do my research and find some instructions to do all this. My c5 is a 98 so idk if I have to do the same thing you would do for a 01-04
The STEAM VENT PIPING under the early LS1 manifolds will contact the underside of the LS6 / 2001-2004 LS-1 manifold. IMHO,,,,,,,,,, All I do to rectify this issue is I BEND the small piping down so the piping is LOWER than the fastener heads that secure the VALVE VALLEY COVER to the engine. The piping is easy to manipulate and bend out of the way. Just be careful not to KINK IT!
OR
You can rip out the early LS1 piping and install the 2001-2004 LS rear blanking plugs and the 2001-2004 LS front crossover tube piping.
I personally would just modify the piping that is already installed. EASY AS PIE!
The manifold then just bolts on! The only real difference is the added "improve plenum volume" inside the LS6 / 2001-2004 style manifold. The added volume is what lowers the BOTTOM of the manifold and that's what contacts the steam crossover piping.
Bill
Bill
OR
You can rip out the early LS1 piping and install the 2001-2004 LS rear blanking plugs and the 2001-2004 LS front crossover tube piping.
I personally would just modify the piping that is already installed. EASY AS PIE!
The manifold then just bolts on! The only real difference is the added "improve plenum volume" inside the LS6 / 2001-2004 style manifold. The added volume is what lowers the BOTTOM of the manifold and that's what contacts the steam crossover piping.
Bill
Bill
Melting Slicks
Joined: Feb 2009
Posts: 2,857
Likes: 234
From: SW Nuh Hampsha
2018 C5 of Year Finalist
Mine is a '98 also, and it's no big deal to put on the LS6 manifold.
The difference between the two is the bottom of the manifold: the LS1 is curved and fits over the crossover pipes underneath it, while the LS6 is flat on the bottom and won't fit as is because the reinforcing ribs underneath the LS6 manifold hit the pipes. It will be obvious once you remove the LS1 manifold.
Then, all you do is Dremel or snap off a few of the ribs on the underside of the LS6 manifold in order to clear the crossover pipes. There is no loss in strength when doing so. To know which ribs to trim, put some paint or nail polish along the top of the steam pipes and set the manifold on top. the paint will transfer to the manifold, indicating what needs to be trimmed. It'll take you 20 minutes tops to do this.
Bill suggests bending the pipes a bit, but the potential for damage to the pipes exists if not done carefully. Either way, you're just making a little clearance for those pipes.
The difference between the two is the bottom of the manifold: the LS1 is curved and fits over the crossover pipes underneath it, while the LS6 is flat on the bottom and won't fit as is because the reinforcing ribs underneath the LS6 manifold hit the pipes. It will be obvious once you remove the LS1 manifold.
Then, all you do is Dremel or snap off a few of the ribs on the underside of the LS6 manifold in order to clear the crossover pipes. There is no loss in strength when doing so. To know which ribs to trim, put some paint or nail polish along the top of the steam pipes and set the manifold on top. the paint will transfer to the manifold, indicating what needs to be trimmed. It'll take you 20 minutes tops to do this.
Bill suggests bending the pipes a bit, but the potential for damage to the pipes exists if not done carefully. Either way, you're just making a little clearance for those pipes.
1st Gear
Joined: May 2018
Posts: 1
Likes: 0
LS6 Intake C5 PCM
[QUOTE=Bill Curlee;1592491860]The STEAM VENT PIPING under the early LS1 manifolds will contact the underside of the LS6 / 2001-2004 LS-1 manifold. IMHO,,,,,,,,,, All I do to rectify this issue is I BEND the small piping down so the piping is LOWER than the fastener heads that secure the VALVE VALLEY COVER to the engine. The piping is easy to manipulate and bend out of the way. Just be careful not to KINK IT!
OR
You can rip out the early LS1 piping and install the 2001-2004 LS rear blanking plugs and the 2001-2004 LS front crossover tube piping.
Do you have to retune your PCM for the LS1 to LS6 intake swap? and if you choose to not retune your PCM will LS1 run to lean? Any suggestions on what to change in HP tuners for LS6 manifold on LS1?
OR
You can rip out the early LS1 piping and install the 2001-2004 LS rear blanking plugs and the 2001-2004 LS front crossover tube piping.
Do you have to retune your PCM for the LS1 to LS6 intake swap? and if you choose to not retune your PCM will LS1 run to lean? Any suggestions on what to change in HP tuners for LS6 manifold on LS1?
Team Owner
Joined: Oct 2006
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The intake is a "supporting" mod. You won't feel a huge difference without other mods, such as cam, exhaust work, etc...so you won't really gain much from a tune with just intake. Save it for when you make bigger changes, unless you have the money.
Last edited by 'Shifter; May 8, 2018 at 02:24 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Its more of a WOT gain but when you add OTHER breathing mods, it will help with the additional air flow needs..No need to tune..
BC
Melting Slicks
Joined: Jul 2015
Posts: 2,277
Likes: 225
From: Round Rock Texas
I also have a 98 and was told by the tuner that the biggest power hold back on the early cars is the heads. I would change those before investing in aintake manifold
Team Owner
Joined: May 2001
Posts: 87,298
Likes: 1,580
From: Western NY
Not to hijack the discussion, but in the pictures posted, I see that there's a piece of that "foam stuff" still attached to the bottom of the manifold. What is the purpose of the stuff?
The reason I ask, is because a couple of years ago, when I removed my intake, to access the oil pressure sender, I also put a sheet of the heat insulation barrier, on the bottom of the intake. In order to do this, I had to remove the OE foam pieces, and ever since then, I've been wondering if I made a mistake by doing so.
The reason I ask, is because a couple of years ago, when I removed my intake, to access the oil pressure sender, I also put a sheet of the heat insulation barrier, on the bottom of the intake. In order to do this, I had to remove the OE foam pieces, and ever since then, I've been wondering if I made a mistake by doing so.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Not to hijack the discussion, but in the pictures posted, I see that there's a piece of that "foam stuff" still attached to the bottom of the manifold. What is the purpose of the stuff?
The reason I ask, is because a couple of years ago, when I removed my intake, to access the oil pressure sender, I also put a sheet of the heat insulation barrier, on the bottom of the intake. In order to do this, I had to remove the OE foam pieces, and ever since then, I've been wondering if I made a mistake by doing so.
The reason I ask, is because a couple of years ago, when I removed my intake, to access the oil pressure sender, I also put a sheet of the heat insulation barrier, on the bottom of the intake. In order to do this, I had to remove the OE foam pieces, and ever since then, I've been wondering if I made a mistake by doing so.
So,, NO,, you didn't hurt or miss anything.
BC
Acct Suspended APR 2026 by request
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2020 Corvette of the Year Finalist (performance mods)
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I thought the foam was to keep dirt/debris/water from getting to the knock sensor holes in the valley cover, I could be wrong though