Tonyrodz
Resident Resident
Sub'd. This is getting good! 
gets 2 pop corns!!
gets 2 pop corns!!
Nnbs intake swap question
- Thread starter JakeO625
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ANY 07+ cathedral truck intake is the same as a tbss intake. TBSS just got it first so thats what everyone refers them as. Once the square port motors took over the intake remained looking the same but change port size, so just make sure its the earlier cathedral version.
Tonyrodz
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How can you tell which is which, visually? To make sure you get the right intake.
12580678 seems to be the part I come up with for an '07 6.0 but it's listed for $184 at Rockauto and I can't tell if it's cathedral or not. Do you have a part number for a $100 one that will work?
The older truck is 3 bolt TB, and the newer truck/tbss is 4 bolt TB. Then when they went to square port they look very similar so you would actually have to look at the port shapes.
Tonyrodz
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So do I want a 3 or 4 bolt tb?
eohat
In Torque We Trust
You’ll need a 4 bolt TB with a TBSS style manifold.
Hot Rod ran a dyno comparison of the NBS and TBSS manifolds on a performance 6.0L engine. With their setup the TBSS manifold was worth an extra 13 hp and 16 lb-ft of torque over the NBS intake.
http://www.hotrod.com/articles/20-ls1-intake-manifolds-tested/
05Single
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You will need the adapter plate. allows you to bolt the 4 bolt to a 3 bolt
eohat
In Torque We Trust
One of the main advantages of the TBSS style manifolds is that they have a larger throttle opening. In the Hot Rod manifold comparison they used a 78mm throttle body on the NBS manifold and a 90mm throttle body on the TBSS manifold, so some of the 13 hp gain was from the larger throttle body. I think a chunk of that gain would be lost with a smaller throttle body.
hoe
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Lol. You need to stick 4bolt tb to use a wider tb. Something bigger than stock 78iirc. That is also part of the gains with the intake. Go at lest 90mm. Again the intake are different. Cause it's a nnbs 6.0 intake doesn't mean it will fit your lq4 or lq9. Those 6.0 and 6.2 come with the same heads. Square. So unless you have those heads then you can use that intake. You could do adapter plate as well if you got cash.
The cts-v intake is a better intake swap these days. It's a twin screw blower for square port heads.
The cts-v intake is a better intake swap these days. It's a twin screw blower for square port heads.
hoe
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To answer the lurking question;
Look at the bottom of the intake runners. 1 is shaped like a cathedral dome entrance. The other number 2 is shaped like a rectangular squarish entrance.
You have a 8 cylinder so should be 8 entrances.
Look at the bottom of the intake runners. 1 is shaped like a cathedral dome entrance. The other number 2 is shaped like a rectangular squarish entrance.
You have a 8 cylinder so should be 8 entrances.
That's understood. I realize I need the cathedral and not the square port intake. And I think we all understand we need 8 intakes for our 8 cylinders. Please. The problem is they don't shop the shape of the intake ports on most of the parts pictures, and there's several different part numbers for NNBS intakes with several different prices ranging from $140 to $200. Now we're also talking that in order to see much gain we also need a bigger throttle body. And yet nobody can provide any part numbers for someone who has an 02 6.0 LQ4 to convert to a NNBS intake and TB ? I'm thinking I need to buy more popcorn. 2 wasn't enough @Tonyrodz ! Or maybe a CTS-V blower instead.
eohat
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hoe
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Yes you need 8 intake runners...
Any Nnbs 6.0 or 6.2 would be square. get a nnbs intake for a 5.3. It will be cathedral as the Nnbs 5.3 uses the lq4 and lq9 heads.
Get a custom 4 bolt throttle body. Cable or drive by wire. Something in the 90-102mm range.
Then you get the intake gains. Want even more gains switch to square port heads and intake.
If you need part numbers do more research but it's a reason it's a custom swap. There is no specific 1 part number. Several will work.
Any Nnbs 6.0 or 6.2 would be square. get a nnbs intake for a 5.3. It will be cathedral as the Nnbs 5.3 uses the lq4 and lq9 heads.
Get a custom 4 bolt throttle body. Cable or drive by wire. Something in the 90-102mm range.
Then you get the intake gains. Want even more gains switch to square port heads and intake.
If you need part numbers do more research but it's a reason it's a custom swap. There is no specific 1 part number. Several will work.
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