might be looking at a tbss intake. I have the stock truck intake as well.
I also have a 102mm tb . Do they fit on oem intakes?

 

the intake snout is much smaller then the 102TB, for driveability and fitment purposes the GM stuff would work just fine. Tbss is a very good intake, just make sure it's the nbss model. On ebay I saw one that had the Intake, rails and injectors for 400 bucks. Gm TB and MAF are cheap as well

 

Why would you put a throttle body on that is larger than the throat of the intake? Because that's what you will have putting a 102 TB on a stock manifold.

 

And any cam that does not require a spring change isnt worth the time. Springs rates need to be increased to compensate for a higher acceleration and jerk profile of the cam lobe. Not needing springs means it's a very lethargic lobe like stock and likely won't make as much power as it does noise.

 

I will see the clearance 1st before I make a intake decission.
the sheet metal intake was for a boost build. The stock truck intake us complete with rails.
If I can trade for a tbss I might do it IF it clears the hood.
let's see
I think both of the intakes I have could work well.. I have seen the sheetmetal ones work on both N/A and boosted of course

 

The sheetmetal intake WILL run.... poorly. Very little low end power.

 

well then the truckintake it is.
will there be a performance gain with a 102mm (or 92mm) dbc TB? Adapters are cheap I saw (25$)

 

Anybody has some good input/ contacts?

 

The one I tuned on a 5.7 GTO engine in a 70 Chevelle had ZERO issues roasting the tires from a stop. Stock stall in the 4L60E and 3.73 gears. Car is on a 295 wide rear tire as well.

The edelbrock proflow also works very well on the 6.0L in my friends 71 Chevelle. With a stock stall 4L80E and 4.10s it effortlessly spins 325 wide drag radials.

 

There are people making 650 RWHP with a ported OE 90 mm tb.
You dont need a 102 till you are well past 500 RWHP and with the cams you are considering, the effort
to use a 102 on a stock intake is pointless.

 

Just run the sheet metal and 102mm. The throttle response will be phenominally better because of the large throttle bore. Run a 4" intake system and a 100mm MAF. It will be a much better looking induction system than that ugly medusa looking truck intake.

Unless you 4-link the car or run slicks you will never plant the torque of the 6.0L from a stop anyway on the street. With the 5.3 heads, a cam and a converter it will be spin city even with drag radials

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Honestly in a classic car I would make the LS look entirely classic.

https://www.jegs.com/i/Holley/510/300-137K/10002/-1

https://www.summitracing.com/parts/sdm-pce138-1002/

Put a standard carb style air cleaner on it. If it has a cowl on the hood, install a cold air kit that seals to the hood.

Run a speed density tune with the MAF deleted. Get the coil covers that hide the coils and make the LS resemble a carb big block.

That is what I would do myself.

 

it would be pointless if I have to buy it.
But I have it already from a previous boost build

 

I ll see what fits under the hood Then I decide... I'm not to concerned about the intake right now.
was just wondering.

 

Sheet metal will run like garbage. Won't make power till 6000+. Edelbrock proflo or high ram holley is best best for performance with little compromise.

 

The one I tuned on a heads/cam LS1 ran great. Idle, Off-idle, Lugging down the highway in 4th gear with the converter locked. WOT from a dead stop it obliterated the 295s with ease. From a 30 mph roll it still got sideways. Maybe you need to find a different tuner.

 

I heard the NA opinions about the sheet metal intake.
I bought it a while ago for previous turbo drag build high rpm. So I was not to concerned about low rpm.
@Fast355 yes the tune is very important on that one.
well it's good that I have choices..lol

 

I am not sure what brand it was but it had a 102mm TB on it. The intake runners had trumpets on the end of them. Ran very well on that 5.7. Also had perfect street manners even with the a/c on.

 

A sheet metal intake will behave nicely at low speeds (more a function of the cam anyway), but won't make nearly as much power as a stock or FAST. You don't have the flow velocity.

 

sound like the one i have. I mean they all China rebranded anyways. The welds look good and clean.
I know jegs and summit put there logo on too as well as some "reputable" LS companies.