The 6.0 LS family, including the LQ4, LQ9, and L96 truck engines, is a very popular swap and build platforms on the planet because it makes serious power for very little fuss. The factory truck intake works fine for a stocker, but the moment you add a cam, better heads, or a higher rev ceiling, that tall truck manifold and its hood-clearance headaches become the bottleneck. Picking the right intake manifold is how you unlock the airflow your 6.0 actually wants.
We pulled together seven intake manifolds that genuinely fit 6.0 LS combinations, covering both cathedral port heads (stock LQ4 and LQ9) and rectangle port conversions. We looked at real-world power gains, hood and accessory clearance, throttle body compatibility, and how each one behaves on the street versus the track. Whether you are doing a budget swap into a classic or chasing the top of the dyno chart, there is a manifold here for your goal.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Holley 300-290 Cathedral Port Intake Manifold Best Overall Cathedral port, 92mm/102mm throttle bore, mid-rise design |
9.5 | 🛒 Check Price |
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Holley 300-294 Hi-Ram Rectangle Port Intake Manifold Best for Big Power Rectangle port, modular tall-runner Hi-Ram, single or dual throttle body top |
9.3 | 🛒 Check Price |
 |
Edelbrock 71197 Pro-Flo XT Cathedral Port Intake Manifold Best Street Manifold Cathedral port, low-profile, 90mm throttle bore opening |
9.1 | 🛒 Check Price |
 |
FAST LSXR 102mm Cathedral Port Intake Manifold Most Proven Cathedral port, 102mm throttle bore, composite, removable runners |
9.0 | 🛒 Check Price |
 |
Holley 300-130 Mid-Rise Cathedral Port Intake Manifold Best Value Cathedral port, mid-rise, 4150 or LS throttle body provisions |
8.8 | 🛒 Check Price |
 |
Edelbrock 71187 Pro-Flo XT Rectangle Port Intake Manifold Best Rectangle Port Rectangle port, low-profile, fits LS3-style rectangle heads on a 6.0 |
8.6 | 🛒 Check Price |
 |
Dorman 615-902 Cathedral Port Intake Manifold Best Stock Replacement Cathedral port, factory-style truck intake replacement with hardware |
8.0 | 🛒 Check Price |
1. Holley 300-290 Cathedral Port Intake Manifold: Best Overall
The Holley 300-290 is the manifold we point most 6.0 LS owners toward because it does the hardest thing well: it makes more power almost everywhere without forcing you to rebuild the rest of the engine bay. It bolts straight onto cathedral port heads, which is exactly what a stock LQ4 or LQ9 6.0 runs, so most truck-engine swappers can use it without changing heads. The mid-rise runner layout keeps the low-end torque that makes these engines so fun to drive while opening up real gains past 5,000 rpm.
Where it earns the top spot is versatility. It accepts large drive-by-wire or cable throttle bodies, has clean injector and fuel rail provisions, and sits low enough to clear far more hoods than the towering factory truck manifold. The honest weakness is that it is not the absolute peak-power champion in this list. If your only goal is a dyno number on a high-rpm race build, a dedicated Hi-Ram will edge it out. For a do-everything 6.0, though, the 300-290 is the smartest pick.
- Fits cathedral port heads including stock LQ4 and LQ9 6.0 castings
- Mid-rise runner design balances low-end torque and top-end power
- Accepts both 92mm and larger throttle bodies with included provisions
Pros: Strong, broad powerband that works on the street and strip; Lower profile clears more hoods than tall factory truck intakes; Bolts to common cathedral port 6.0 heads with no machining
Cons: May need a different throttle body and fuel rail spacers depending on combo; Hi-Ram and taller versions exist if you want even more peak top end
2. Holley 300-294 Hi-Ram Rectangle Port Intake Manifold: Best for Big Power
If your 6.0 LS has been converted to rectangle port heads and you want it to scream at the top, the Holley 300-294 Hi-Ram is built for that mission. The tall runners and big plenum are tuned to keep filling the cylinders well past the rpm where a low-rise intake gives up, which is exactly what an aggressive cam and ported rectangle heads are begging for. The modular top plate is the clever part, because you can run a single big throttle body now and step up to a dual setup later without buying a whole new manifold.
The trade-off is height and head compatibility. This intake stands tall, so unless you are running a cowl hood, a scoop, or a build where hood clearance does not matter, it will likely poke through. It also demands rectangle port heads, meaning a stock cathedral port 6.0 needs a head change before it bolts on. Accept those conditions and you get one of the best top-end manifolds you can put on an LS, with the flexibility to evolve as your build does.
- Tall Hi-Ram runners optimized for high-rpm rectangle port airflow
- Modular top plate accepts single or dual throttle body configurations
- Removable lid simplifies injector and fuel rail service
Pros: Outstanding top-end power for cammed, high-revving 6.0 builds; Modular design lets you change throttle body setup later; Plenty of room for large single or twin throttle bodies
Cons: Tall design rarely clears a stock hood without a cowl or scoop; Requires rectangle port heads, so a cathedral 6.0 needs a head swap
3. Edelbrock 71197 Pro-Flo XT Cathedral Port Intake Manifold: Best Street Manifold
The Edelbrock 71197 Pro-Flo XT is the one we reach for when the build is a daily-driven 6.0 or a swap squeezed into a car that never had an LS in it. Its low-profile shape is the headline feature, because clearance is often the real enemy in a tight engine bay, and this manifold tucks down where the factory truck intake never could. It uses a cathedral port flange, so it drops onto stock LQ4 and LQ9 6.0 heads without any porting drama.
On the street it delivers exactly what most people actually want from a 6.0: a thick, usable wave of midrange torque that makes the truck or swap feel strong from a roll. The limitation is that Edelbrock tuned it for that street character rather than chasing peak numbers, so a high-rpm race motor will out-breathe it eventually. As a clean, well-cast, drivability-first intake for cathedral port 6.0 engines, though, it is hard to beat.
- Low-profile casting designed for excellent hood clearance
- Cathedral port flange fits stock 6.0 LQ4 and LQ9 heads
- Tuned runners favor strong midrange street torque
Pros: Great hood clearance for tight engine bays and swaps; Smooth, torque-rich street manners; Quality Edelbrock casting and finish
Cons: Not aimed at maximum high-rpm peak power; Throttle body and sensor adapters may be needed for some setups
4. FAST LSXR 102mm Cathedral Port Intake Manifold: Most Proven
Few intakes have logged as many miles and dyno pulls on 6.0 LS engines as the FAST LSXR 102. The cathedral port version bolts onto stock 6.0 heads and pairs a generous 102mm throttle bore with a composite body that does not soak up heat the way aluminum does, which helps keep intake charge temps down and power consistent on hot days. The removable runners are a favorite feature among tuners, because they make porting and injector swaps far less of a chore.
It is one of the safest, most predictable upgrades you can make, which is exactly why it shows up on so many builds. The honest caveats are practical ones: the plenum stands tall enough to fight some hoods, and to actually use that 102mm opening you want a matching 102mm throttle body rather than a smaller one choking the inlet. Feed it correctly and the LSXR rewards you with a broad, reliable power increase that has been validated thousands of times over.
- 102mm throttle body bore for high airflow potential
- Composite construction keeps intake charge temperatures lower
- Removable runners allow porting and easy injector access
Pros: Huge track record on cathedral port LS and 6.0 engines; Composite material resists heat soak better than aluminum; Serviceable runners make porting and tuning easier
Cons: Tall plenum can challenge hood clearance on some swaps; You usually need a matching 102mm throttle body to use the full bore
5. Holley 300-130 Mid-Rise Cathedral Port Intake Manifold: Best Value
The Holley 300-130 is the manifold we recommend when someone wants a real, measurable improvement over the stock 6.0 truck intake without spending up for a flagship piece. It uses a mid-rise runner design that holds onto the low and midrange grunt these engines are known for while freeing up airflow higher in the rev range. Because it carries a cathedral port flange, it bolts onto the stock LQ4 and LQ9 heads that the vast majority of 6.0 swappers already have.
What makes it the value pick is that it delivers most of what a casual to mid-level build needs and skips the cost of features only a race motor would use. The compromise is that it sits in the middle of the pack on peak power, so if your goal is a screaming high-rpm combination, the Hi-Ram or a 102mm intake will pull ahead up top. For a street truck or a sensible swap, the 300-130 gives you a strong return for what you put in.
- Mid-rise runner profile blends torque and upper-rpm power
- Cathedral port flange fits common 6.0 truck heads
- Available throttle body provisions for flexible inlet choices
Pros: Solid power gains without a premium outlay; Reasonable height for better clearance than tall race intakes; Proven Holley design and casting quality
Cons: Throttle body adapter may be required depending on your setup; Not the top choice for an all-out high-rpm peak power chase
6. Edelbrock 71187 Pro-Flo XT Rectangle Port Intake Manifold: Best Rectangle Port
When a 6.0 LS gets upgraded to rectangle port heads but the owner still wants a low, civilized intake rather than a towering race manifold, the Edelbrock 71187 Pro-Flo XT is the answer. It carries a rectangle port flange to match LS3-style heads while keeping the same low-profile philosophy as its cathedral port sibling, so clearance stays friendly in tight engine bays and under stock-ish hoods. The runner tuning leans toward street and midrange punch, which is what most rectangle-converted 6.0 street builds are actually after.
The boundaries are clear. This is strictly for 6.0 engines that already wear rectangle port heads, so cathedral port truck motors need a different manifold or a head swap first. And because Edelbrock built it for drivability, it is not the part you choose to chase the last few horsepower at high rpm. For a clean-running, well-clearing rectangle port street setup, it is an excellent and refined choice.
- Rectangle port flange for 6.0 builds converted to rectangle heads
- Low-profile casting aids hood and accessory clearance
- Runner design tuned for strong street and midrange response
Pros: Great clearance for a rectangle port intake; Smooth, streetable power delivery; Quality Edelbrock fit and finish
Cons: Only suits 6.0 engines running rectangle port heads; Not designed for maximum top-end race power
7. Dorman 615-902 Cathedral Port Intake Manifold: Best Stock Replacement
Not every 6.0 LS project is a power chase. Plenty of swaps and repairs just need a sound, correct intake that restores the engine to how the factory intended, and that is exactly where the Dorman 615-902 belongs. It is a factory-style cathedral port replacement for the common GM truck intake, so it bolts onto stock LQ4 and LQ9 heads and brings back smooth, predictable drivability. Dorman includes the gaskets and hardware, which keeps the install clean and saves a parts-store trip.
Its honesty is its strength: it is built to match stock airflow and behavior, not to add horsepower, so nobody should expect dyno gains from it. It also keeps the tall truck-style profile, meaning the same hood-clearance limits as the original carry over. If your manifold cracked, your swap wants OEM-style manners, or you simply need a dependable replacement that just works, the 615-902 is the right tool for that specific job.
- Direct factory-style replacement for cracked or worn 6.0 truck intakes
- Cathedral port fit for stock LQ4 and LQ9 6.0 heads
- Includes gaskets and hardware for a straightforward installation
Pros: True bolt-on fit that restores stock drivability; Comes with the gaskets and hardware needed to install; Reliable choice for repairs and faithful swaps
Cons: Designed to match stock airflow, not to add power; Tall truck-style profile keeps the same clearance limits as factory
Frequently Asked Questions
Will a cathedral port intake fit my 6.0 LS?
Most factory 6.0 truck engines, including the LQ4, LQ9, and many L96 castings, use cathedral port heads, so a cathedral port intake like the Holley 300-290, Edelbrock 71197, or FAST LSXR 102 bolts right on with no machining. The only way a 6.0 needs a rectangle port intake instead is if it has been converted to rectangle port heads such as LS3-style castings. Pull a valve cover or check your head casting numbers if you are unsure, because matching the manifold port shape to your heads is the single most important fitment detail.
Do I need a bigger throttle body with a new intake manifold?
It depends on the manifold opening. A 90mm or 92mm intake is happy with a common LS throttle body, but a 102mm manifold like the FAST LSXR is only worth its larger bore if you feed it a matching 102mm throttle body, otherwise the smaller inlet becomes the restriction. On a mild 6.0 a stock throttle body is usually fine, while a cammed, higher-rpm build benefits from going larger. Always confirm whether your chosen manifold needs a specific bolt pattern, drive-by-wire versus cable, or an adapter before you order.
Will an aftermarket intake clear my hood?
Clearance is one of the biggest real-world issues on 6.0 swaps. Low-profile manifolds like the Edelbrock Pro-Flo XT are designed to tuck down and clear tight engine bays, while tall Hi-Ram intakes such as the Holley 300-294 almost always need a cowl hood, a scoop, or a build where clearance is not a concern. Mid-rise designs like the Holley 300-290 and 300-130 sit in between and clear far more hoods than the factory truck intake. Measure your available height before choosing, especially in a non-LS car that was never designed around this engine.
How much power will an intake manifold add to a 6.0 LS?
On a stock 6.0, swapping from the truck intake to a good aftermarket manifold typically frees up a modest but real gain, with most of it showing up in the upper rpm range. The bigger gains come when the rest of the combo can use the airflow, meaning a cam, better heads, and a properly sized throttle body. An intake is an enabler more than a standalone power adder, so a Hi-Ram or 102mm manifold on a cammed, rectangle-headed 6.0 will show much larger numbers than the same part on an otherwise stock engine. Tune accordingly to get the full benefit.
Can I reuse my factory fuel rails and injectors?
In many cases yes, but it varies by manifold. Several of these intakes are designed to accept factory-style fuel rails and injectors, while others may need rail spacers, different mounting hardware, or specific injector lengths. Composite manifolds like the FAST LSXR and modular designs like the Holley Hi-Ram make injector and rail access easier thanks to removable runners or lids. Check the manufacturer notes for your exact part, and have gaskets on hand, because reusing rails and injectors only works cleanly when the manifold was built to accommodate them.
Our Verdict
For most 6.0 LS owners, the Holley 300-290 cathedral port intake is the best overall pick because it bolts onto stock LQ4 and LQ9 heads, broadens the powerband everywhere, and clears more hoods than the factory truck manifold without forcing a head swap. If your 6.0 wears rectangle port heads and you are chasing serious high-rpm power, the Holley 300-294 Hi-Ram is the standout runner up, with modular flexibility that grows alongside your build. Match the port shape to your heads and the right throttle body, and either one will transform how your 6.0 breathes.
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