Best Square Port LS Intake Manifolds for GM V8 Engines
Shop-ready square port LS intake manifolds offer a balance of strong airflow, compatibility, and straightforward installation for GM LS families. This guide highlights five top options, covering single-plane and hi-ram designs to match various racing and street setups. Each product section includes key specs from the manufacturer and real-world fit notes to help you select the right manifold for your LS3, L76, L92, L99, LS1, LS2, or LS6 builds.
| Product | Brand | Key Features |
|---|---|---|
| 300-136 Intake Manifold | JGhyperX Store | Single plane, rectangle port, 2,500-7,000 RPM, 5.417 in height |
| 300-132 Carbureted Intake Manifold | JGhyperX Store | Single plane, cathedral/rectangle port, 2,500-7,000 RPM, 4.95 in height |
| 300-116 Hi-Ram EFI Intake Manifold | JGhyperX Store | Hi-Ram, 92 mm bore, 3,500-8,000 RPM, 12.32 in height |
| A-Team Performance LS Rectangle Port Intake Manifold | A-Team Performance Store | 102 mm throttle body, includes rails and hardware |
| LS1/LS2/LS6 102mm High Gen II Intake Manifold | — | 9.65L plenum volume, black finish, 3 mm aluminum |
300-136 Intake Manifold, Single Plane
Compatibility centers on GM EFI LS3, L76, L92, and L99 rectangle-port 6.2L/376 V8 engines. This high-flow single-plane intake supports a broad RPM range from 2,500 to 7,000, delivering improved air velocity and throttle response for performance builds. The unit uses a standard deck height with complete intake sections included, making it a straightforward upgrade for enthusiasts upgrading to EFI multi-port injection. The part numbers listed (300-136, HLY-300136) help ensure correct fitment and aftermarket compatibility.
300-132 Carbureted Single-Plane Manifold
This aluminum single-plane manifold is designed for Chevy Small Block SBC engines with Cathedral Port configurations but also fits GM LS1/LS2/LS6 variants through compatible port matching. It targets a 2,500-7,000 RPM operating window and comes with a complete intake kit. Its 4.95-inch height keeps overall package dimensions reasonable while enabling a robust 4-barrel carburetor setup for traditional performance applications. Part numbers HLY-300132 and 300-132 identify a clear fitment path for builders seeking a carbureted LS intake option.
300-116 Hi-Ram EFI Intake Manifold
The 300-116 Hi-Ram EFI intake presents a high-rise design with a 92 mm throttle body bore, tailored for LS3/L76/L92/L99 configurations in a 6.0L–6.2L V8. It supports a broad EFI multi-port fuel injection setup and is optimized for a front/rear height of 12.32 inches. With a complete installation kit and standard deck height, this manifold aims to maximize airflow at higher RPMs, making it a strong option for performance street and race builds that require enhanced throttle response and top-end power.
A-Team Performance LS Rectangle Port Intake Manifold
Engineered for Chevrolet Small Block Gen III/IV engines, this LS rectangle port intake features a 102 mm throttle body opening and velocity-stacked runners to improve airflow and engine responsiveness. The kit includes fuel rails, a crossover, throttle cable bracket, gaskets, and hardware, offering a complete installation solution. Its black anodized finish adds a durable, high-end appearance in the engine bay, while the manifold’s aluminum construction emphasizes light weight and strength for performance applications.
LS1/LS2/LS6 102mm Gen II Intake Manifold
This Gen II high-performance manifold delivers a 9.65-liter plenum volume with a stealthy black finish for under-hood aesthetics. Constructed from 3 mm thick T6061 aluminum, it emphasizes durability and rigidity for high-demand applications. A MAP sensor port and integrated fuel rails are typical features for EFI setups, making this unit a robust choice for enthusiasts pursuing maximum intake flow and improved fuel atomization at higher RPMs.
Buying Guide
- Engine compatibility: Confirm port type (rectangle vs cathedral) and deck height to ensure a proper match with your GM LS engine family and cylinder heads.
- Intake style: Choose between single-plane for higher RPM power and throttle response, or hi-ram/long-runner designs for top-end advantage in drag and circle track settings.
- Throttle body and fuel system: Verify required throttle bore size (e.g., 92 mm) and whether rails, crossovers, and gaskets are included, as some manifolds come as complete kits while others require separate parts.
- RPM range and displacement: Match the manifold’s intended RPM window to your build goals (daily driving, street/strip, or race conditions). Higher RPM designs may require supporting components for reliability.
- Material and finish: Aluminum manifolds reduce weight and resist heat; black or silver finishes can affect under-hood aesthetics and corrosion resistance.
- Installation considerations: Check deck height and mounting compatibility with your engine block, as well as carbureted vs EFI requirements and any fuel rail or carburetor adapters needed.
- Support and warranty: Look for manifolds that include comprehensive installation hardware and clear return policies, especially when upgrading a new setup.
- Long-term performance: Consider the overall intake system including intake runners, plenum volume, and air velocity improvements to ensure gains align with your goals.