Converting an LS engine to carburetion requires the right intake manifold to match airflow, hood clearance, and fuel delivery. We researched manufacturer specifications, industry standards, and aggregated owner feedback to compare seven real products available on Amazon. Our evaluation focuses on performance gains, fitment ease, durability, and value so you can choose the best LS intake for your build.
| Photo | Product | Score | Buy |
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Holley 300-110 Low Profile Intake Manifold Best Overall Low profile design, 4150/4160 flange, 1.8-inch drop, single-plane |
9.2 | 🛒 Check Price |
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Edelbrock 71187 Performer RPM LS1 Intake Best Dual-Plane Dual-plane design, 4150 flange, for LS1/LS2/LS6, 2.25-inch drop |
8.9 | 🛒 Check Price |
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Weiand 8151 Action Plus LS Intake Best Budget Dual-plane, 4150 flange, for LS1/LS2, 2.5-inch drop, cast aluminum |
8.4 | 🛒 Check Price |
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Holley 300-116 Hi-Ram Intake Manifold Best for High Horsepower Single-plane, 4150 flange, raised runners, for LS cathedral/rectangular ports |
9.0 | 🛒 Check Price |
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Edelbrock 71188 Victor Jr. LS Intake Best Single-Plane Race Single-plane, 4150 flange, for LS1/LS2/LS6, 2.5-inch drop |
8.7 | 🛒 Check Price |
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BTR (Brian Tooley Racing) Carbureted LS Intake Best for Rectangular Ports Single-plane, 4150 flange, for LS3/LS7 rectangular port heads, 2.0-inch drop |
8.2 | 🛒 Check Price |
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Summit Racing SUM-226000 LS Carbureted Intake Best Value Dual-Plane Dual-plane, 4150 flange, for LS1/LS2 cathedral ports, 2.0-inch drop, cast aluminum |
7.8 | 🛒 Check Price |
1. Holley 300-110 Low Profile Intake Manifold: Best Overall
In our evaluation, the Holley 300-110 stands out as the top choice for most carbureted LS swaps. Its low-profile design clears many hoods that other intakes cannot, and the single-plane runner layout delivers strong mid-range to top-end horsepower on 5.3L to 6.0L engines. Based on owner feedback and the spec sheets, this manifold is a favorite among hot rodders and track enthusiasts who need reliable power without cutting the hood.
However, this intake is not the best for stock or near-stock LS engines. If you are running a mild cam and stock heads, the runner volume may be too large, hurting low-end torque. We recommend skipping this pick if your build is primarily for street cruising and you want responsive low-end power. For a balanced setup, consider a dual-plane design instead.
- Designed for carbureted LS swaps with tight hood clearance
- Single-plane plenum for strong top-end power on 5.3L-6.0L engines
- Cast aluminum construction with CNC-machined ports
Pros: Excellent hood clearance for low-profile swaps; Bolts up easily with standard LS gaskets; Proven power gains on dyno tests
Cons: Not ideal for stock or mild cams; best with moderate to aggressive builds
2. Edelbrock 71187 Performer RPM LS1 Intake: Best Dual-Plane
We researched the Edelbrock 71187 as a top dual-plane option for carbureted LS builds. Its design prioritizes low-end torque and drivability, making it ideal for street cars and trucks. Owner feedback highlights improved throttle response and smooth power delivery from idle to 6000 rpm. The included water crossover and heater fittings simplify installation, and the build quality is typical of Edelbrock’s reputation.
One limitation is its height, which may require a hood scoop or aftermarket hood on many vehicles. If you have a stock hood with minimal clearance, this intake might not fit without modification. We suggest skipping this pick for extreme low-profile builds or if you are chasing peak top-end horsepower on a race-only vehicle.
- Dual-plane plenum improves low-end torque and throttle response
- Designed for LS1, LS2, and LS6 engines with cathedral port heads
- Includes water crossover and heater hose fittings
Pros: Great low-end torque for street-driven LS swaps; High-quality cast aluminum with smooth runners; Comes with necessary fittings for easy installation
Cons: Taller than some low-profile intakes; check hood clearance
3. Weiand 8151 Action Plus LS Intake: Best Budget
In our comparison, the Weiand 8151 offers solid performance at a lower price point. It is a dual-plane intake that delivers decent low-end torque for street-driven LS swaps. Based on owner feedback, it is a popular choice for budget builds where cost is a primary concern. The included water neck and gaskets reduce extra purchases, and the fitment on cathedral port heads is good.
However, the Weiand 8151 does not match the peak horsepower of premium intakes from Holley or Edelbrock. If you are building a high-horsepower engine with aggressive cam and heads, this intake may become a restriction. We recommend skipping this pick if you plan to rev past 6500 rpm or need maximum airflow for a forced induction setup.
- Affordable dual-plane manifold for budget builds
- Works with stock LS1 and LS2 cathedral port heads
- Includes water neck and gaskets
Pros: Very good value for the price; Good low-end torque for street driving; Easy installation with included parts
Cons: Slightly less top-end power than more expensive options
4. Holley 300-116 Hi-Ram Intake Manifold: Best for High Horsepower
We evaluated the Holley 300-116 as a top performer for high-horsepower carbureted LS engines. Its raised runner design and large plenum volume support high-rpm airflow, making it a favorite among drag racers. Owner feedback confirms significant power gains over stock intakes when paired with aggressive cams and heads. The manifold accommodates both cathedral and rectangular port heads, adding flexibility.
However, this intake is tall and often requires a hood scoop or aftermarket hood. It is also more expensive than many alternatives. We recommend skipping this pick if you have a low-profile hood or are building a street-driven car where low-end torque matters more than peak power. For a daily driver, a dual-plane design would be more suitable.
- Raised runner design for high-rpm power gains
- Accepts both cathedral and rectangular port heads
- Includes water crossover and fuel rail mounts
Pros: Excellent top-end horsepower for race builds; Versatile port compatibility; High-quality casting and machining
Cons: Tall profile requires significant hood clearance or scoop
5. Edelbrock 71188 Victor Jr. LS Intake: Best Single-Plane Race
In our research, the Edelbrock 71188 Victor Jr. is a purpose-built race intake for carbureted LS engines. It delivers strong power above 4000 rpm, making it ideal for track use. Owner feedback from drag racers indicates consistent performance gains. The lightweight construction helps reduce overall vehicle weight, and the fitment on cathedral port heads is precise.
This intake is not recommended for street driving, as it lacks low-end torque and may feel sluggish at lower RPMs. If your LS build is primarily for road driving or towing, we suggest looking at a dual-plane option instead. It also requires careful tuning to realize its full potential.
- Race-proven single-plane design for high-rpm power
- Designed for LS1, LS2, LS6 cathedral port heads
- Lightweight cast aluminum construction
Pros: Outstanding top-end horsepower potential; Lightweight compared to cast iron intakes; Good fit and finish
Cons: Sacrifices low-end torque for peak power
6. BTR (Brian Tooley Racing) Carbureted LS Intake: Best for Rectangular Ports
We compared the BTR carbureted intake as a specialized option for rectangular port LS engines like the LS3 and LS7. It offers a low-profile design that fits under many stock hoods, which is a common challenge. Owner feedback highlights its ease of installation and noticeable power gains over stock intakes. The single-plane layout provides solid mid-to-top-end power suitable for performance street and strip use.
However, this intake only fits rectangular port heads, so it is not compatible with cathedral port engines. If you have an LS1 or LS2, you must look elsewhere. Additionally, while the low-profile helps clearance, it may still require a drop base air cleaner on some vehicles. We recommend skipping this pick if you are building a cathedral port engine or need maximum top-end power for all-out racing.
- Designed specifically for rectangular port LS heads
- Low-profile design aids hood clearance
- Includes water crossover and fuel rail provisions
Pros: Great option for LS3/LS7 swaps; Good build quality from a reputable brand; Reasonable price for a specialized intake
Cons: Limited to rectangular port heads; not universal
7. Summit Racing SUM-226000 LS Carbureted Intake: Best Value Dual-Plane
In our evaluation, the Summit Racing SUM-226000 offers a solid entry-level option for carbureted LS builds on a tight budget. It provides decent low-end torque and throttle response for street-driven vehicles. Owner feedback notes that it is a direct fit on cathedral port heads and includes necessary hardware. The dual-plane design helps maintain drivability.
However, this intake does not deliver the same peak horsepower as higher-priced competitors. It is best suited for stock or mildly modified engines. If you are building a high-performance LS with aggressive cams or forced induction, we recommend investing in a more capable manifold. This pick is ideal for budget-conscious builders who prioritize cost over absolute performance.
- Budget-friendly dual-plane manifold for street builds
- Fits cathedral port LS1 and LS2 heads
- Includes water neck and gaskets
Pros: Very affordable for a dual-plane intake; Good low-end torque for daily driving; Easy installation with basic tools
Cons: Lower power potential than premium brands
Frequently Asked Questions
Can I use a carbureted intake on an LS engine that originally had fuel injection?
Yes, you can convert an LS engine to carburetion by replacing the factory intake with a carbureted intake manifold. You will also need a carburetor, a fuel pressure regulator to lower fuel pressure, and a mechanical or electric fuel pump. The intake must match your cylinder head port shape (cathedral or rectangular).
What is the difference between single-plane and dual-plane LS carb intakes?
Single-plane intakes have a large open plenum that delivers strong top-end power but can hurt low-end torque. Dual-plane intakes split the plenum into two sections, improving low-end torque and throttle response at the expense of some top-end power. Choose based on your driving style: dual-plane for street, single-plane for track.
Will these intakes fit under a stock hood?
It depends on the specific intake and vehicle. Low-profile intakes like the Holley 300-110 often fit under stock hoods, but taller designs like the Holley 300-116 or Edelbrock 71187 may require a hood scoop or aftermarket hood. Always measure your engine bay clearance before purchasing.
Do I need to modify the LS engine to install a carbureted intake?
No major modifications are required, but you will need to remove the factory fuel injection components. The intake manifold bolts directly to the cylinder heads using factory bolt holes. You may need to block off coolant passages or add a water crossover, depending on the intake. Most aftermarket intakes include necessary fittings.
What carburetor size is recommended for an LS with a carb intake?
For a 5.3L to 6.0L LS engine, a 650-750 CFM carburetor is typical for street use. Larger engines or high-rpm builds may benefit from 750-850 CFM. The intake manifold flange (usually 4150) accepts standard square-bore carburetors. Tuning is essential for optimal performance.
Our Verdict
After researching and comparing specifications, owner feedback, and industry standards, our top pick is the Holley 300-110 Low Profile Intake Manifold for its excellent hood clearance, proven power gains, and overall value. For those prioritizing low-end torque and street drivability, the Edelbrock 71187 Performer RPM is the runner-up, offering a dual-plane design that enhances throttle response.
