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L83 intake manifold swap

romeoortiz92

By romeoortiz92
in Engines & Drivetrain

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07Softail Senior Enthusiast

07Softail

Posted
Posted

Yeah, lt1 would need a custom fabbed intake. That's too severe of an angle to try and make work with the air box. L86 intake it is for me then lol

 

Sent from my SAMSUNG-SM-G890A using Tapatalk

PMed you

 

RT

  • 3 months later...
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truckguy82
truckguy82

I don't think there's a lot of power to be had with it   I only say that because I have an l86 and all I want is an lt1 or msd intake

Jon A
Jon A

The AFE intake will work with the LT1 or MSD manifold since you can swivel the tube on the box. I had to cut the end of mine off and use a new coupler but it worked fine other than that.

Posted Images

MattM2485 Enthusiast

MattM2485

Posted
Posted

Does anyone have a l86 intake manifold and throttle body for sale?

 

You can get both from pace performance for under $250

  • 4 months later...
JRoyPDX Enthusiast

JRoyPDX

Posted
Posted (edited)

Correct me if I am wrong, but I just went on 2 GM parts lookup sites and it lists the same intake manifold for both L83 and L86

 

EDIT - Don't trust those I guess. Pace Performance lists 12639087 and those lookup websites say they do fit the 6.2 Silverado. Retarded.

 

I looked up a 2017 Silverado LT 5.3 and got these part numbers:

Intake - 12623417

Throttle body - 12617792

 

I looked up a 2017 Silverado LTZ 6.2 and got these part numbers:

Intake - 12623417

Throttle body - 12620263

 

Only the TB lists differently. Just to be sure I looked up the same on a 2014 as well. If they are the same I hope nobody is wasting their money on swaps...

Edited by JRoyPDX
Txjose Senior Enthusiast

Txjose

Posted
Posted

The AFE intake will work with the LT1 or MSD manifold since you can swivel the tube on the box. I had to cut the end of mine off and use a new coupler but it worked fine other than that.

got a picture of it?

408LSX Enthusiast

408LSX

Posted
Posted (edited)

Correct me if I am wrong, but I just went on 2 GM parts lookup sites and it lists the same intake manifold for

 

EDIT - Don't trust those I guess. Pace Performance lists 12639087 and those lookup websites say they do fit the 6.2 Silverado. Retarded.

 

I looked up a 2017 Silverado LT 5.3 and got these part numbers:

Intake - 12623417

Throttle body - 12617792

 

I looked up a 2017 Silverado LTZ 6.2 and got these part numbers:

Intake - 12623417

Throttle body - 12620263

 

Only the TB lists differently. Just to be sure I looked up the same on a 2014 as well. If they are the same I hope nobody is wasting their money on swaps...

They are different, I just did the swap yesterday. The L83 has an 80mm tb and the L86 uses 87mm tb. The opening on intake is clearly bigger.

Edited by 408LSX
JRoyPDX Enthusiast

JRoyPDX

Posted
Posted

They are different, I just did the swap yesterday. The L83 has an 80mm tb and the L86 uses 87mm tb. The opening on intake is clearly bigger.

How were your results?
408LSX Enthusiast

408LSX

Posted
Posted

How were your results?

Seems to pull harder up top and throttle response seems better. I still need to get it retuned also.

L86 All Terrain Senior Enthusiast

L86 All Terrain

Posted
Posted (edited)

Would the engine even account for the swap without tuning? The ECU controls a/f, so without accounting for the ability to use more air and in-turn fuel, would the engine operate as normal? Or would the computer realize it has more air availble and adjust itself over time? I assumed no gain would be noticed, but dyno results prove a CAI with no tune can help or hurt gains. I know it was a popular mod to put LS7 TBs on gen III-IV's but most people were tuning for it. Curious to see your results if you can get it on a dyno for a baseline and tuned pull.

Edited by L86 All Terrain
JRoyPDX Enthusiast

JRoyPDX

Posted
Posted

Would the engine even account for the swap without tuning? The ECU controls a/f, so without accounting for the ability to use more air and in-turn fuel, would the engine operate as normal? Or would the computer realize it has more air availble and adjust itself over time? I assumed no gain would be noticed, but dyno results prove a CAI with no tune can help or hurt gains. I know it was a popular mod to put LS7 TBs on gen III-IV's but most people were tuning for it. Curious to see your results if you can get it on a dyno for a baseline and tuned pull.

It should see the additional air and adjust for its pre-programmed fuel trims so in theory you should see some difference in it. Tuning will of course net the best results.
  • 2 years later...
BlancoSilverado Enthusiast

BlancoSilverado

Posted
Posted

Do you guys know if a L86 throttle body would fit on a L83/L84 intake manifold?

Im plan on doing both, but just wan the question answered.

14 gmcl83 Enthusiast

14 gmcl83

Posted
Posted

No the l86 is 87 mm the l83 Tb is 80 mm so it won’t fit on a l83 intake manifold.

BlancoSilverado Enthusiast

BlancoSilverado

Posted
Posted (edited)
5 minutes ago, 14 gmcl83 said:

No the l86 is 87 mm the l83 Tb is 80 mm so it won’t fit on a l83 intake manifold.

Im talking about bolting up. Ive seen where a 102mm will replace a 92mm for LS3.

Edited by BlancoSilverado
BlancoSilverado Enthusiast

BlancoSilverado

Posted
Posted
12 minutes ago, 14 gmcl83 said:

Oh my bad I would think it would it still 4 bolts 

Ya i know that they do but the bolt pattern might be different.

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