New intake

[Tonyrodz]

The stock Gen3 truck intake outflows the LS1 intake. It's on-par with the LS6 intake. But, with the truck intake, the power is emphasized lower in the RPM band then tapers off at the upper RPMs. The LS6 intake has this sort of reversed.

Also, you have to do some finagling to run the car intake with truck accessories: Some slicing of the alternator bracket and relocating an idler pulley at least. I'd say this is why he went with the truck intake. Or it could be because of the fuel rail type- is your truck intake a return or returnless?

Since you have a 5.7 with a cam and heads, I'd say you're shorting yourself with the stock Gen3 intake manifold. I'd get the "TBSS" manifold. BTW, in case you didn't know, it's the standard Gen4 IM. Don't get one from an actual TBSS- that'd make the price skyrocket. Yank one from an Express 2500 at the salvage yard.

I actually have one for sale--if interested.

 

[Tamcphail89]

That's a tbss? I'll send you a pm


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[Tonyrodz]

That's a tbss? I'll send you a pm


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No, from a Chevy express.

 

[iamdub]

TBSS manifold is a 4-bolt TB. The ribs on the top also look different:




Good reading:

https://www.glennsautoperformance.com/pages/intake-faq


Grab a manifold off any 2007+ ("NNBS") with a 5.3- it's the same thing.

 

[iamdub]

I believe I have a typical return style.

I have 42lb injectors. Would those work with a nnbs/tbss intake?


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It's not the lb/hr. that's in question- it's the size (length/height). 42 is a good size for mild-moderate mods.

 

[Sam Harris]

TBSS manifold is a 4-bolt TB. The ribs on the top also look different:




Good reading:

https://www.glennsautoperformance.com/pages/intake-faq


Grab a manifold off any 2007+ ("NNBS") with a 5.3- it's the same thing.

Awesome! Thanks Dub!