Best Square Port LS Intake Manifolds for GM V8 Engines in 2026
If you’re upgrading a GM LS-based engine and want improved airflow without a complete EFI swap, a square port LS intake manifold is a strong option. This guide highlights five square-port manifolds suited for LS3/LS7-era engines and related small-block variants, focusing on compatibility, RPM range, and installation considerations. These selections are best for hot-rodders seeking better high-RPM performance, street enthusiasts chasing stronger mid-range torque, and builders aiming for straightforward bolt-on upgrades.
| Product | Engine Fit | Intake Style | Best For |
|---|---|---|---|
| 300-136 Intake Manifold Aluminum EFI LS Single Plane Mid-Rise | GM LS3/L76/L92/L99 Rectangle Port | Single plane | EFI-equipped builds, high-RPM responsiveness |
| 300-132 LS Mid-Rise Carbureted Intake Manifold Aluminum Single Plane | GM LS1/LS2/LS6 Cathedral Port to LS rectangular port bridges | Single plane | Carbureted LS setups, strong mid-range torque |
| 300-116 Hi-Ram EFI Intake Manifold Aluminum 92mm | GM LS3/L76/L92/L99 6.0L-6.2L EFI | Hi-Ram | Top-end power for EFI, large throttle body |
| A-Team Performance LS Rectangle Port Intake Manifold | Chevrolet Small Block Gen III/IV, 4.8-6.2L | Rectangle port, 102mm TB | Balanced airflow with complete install kit |
| LS1/LS2/LS6 102mm High Gen II Intake Manifold | LS1/LS2/LS6 family engines | Rectangle port, high-volume plenum | Big-volume, high-performance EFI/NA builds |
300-136 Intake Manifold Aluminum EFI LS Single Plane
Best for EFI-equipped LS engines that need a compact, single-plane design for high-RPM performance. Fits GM EFI LS3/L76/L92/L99 rectangle-port 6.2L/376 V8 blocks. A solid choice for hot-rods needing improved air flow at 2,500–7,000 RPM.
Who it’s for: buyers building an EFI LS3/LS4-based setup who want a straightforward, mid-rise single-plane manifold with complete intake section included. This model supports multi-port injection and standard deck height.
Caution: Designed for rectangle-port rectangles; verify port matching with your exact head configuration to avoid isolation gaps at the ports.
300-132 LS Mid-Rise Carbureted Intake Manifold Aluminum Single Plane
Best for carbureted LS builds bridging Cathedral Port to rectangle-port setups, offering a compact mid-rise profile. This 4-barrel square bore manifold is ideal for 1997–2007 Chevy Small Block SBC conversions that transition to LS heads while preserving a carbureted throttle body.
Who it’s for: buyers running carbureted LS combos or retrofitting modern LS engines into classic muscle cars. It is a better choice when you want a simpler fuel system without EFI electronics.
Caution: Carbureted mounting requires compatible fuel delivery components and gaskets; verify compatibility with your carb kit and distributor clearance.
300-116 Hi-Ram EFI Intake Manifold 92mm
Best for EFI-equipped LS builds needing a high-flow, hi-ram design with a 92mm throttle body bore. Front/rear height at 12.32 inches provides room for large throttle bodies and optimized air delivery in high-performance applications.
Who it’s for: buyers pursuing maximum top-end power from EFI engines, especially when a higher-rise intake is feasible within the engine bay. This is a strong pick for racers or high-performance street cars.
Caution: The tall height may require hood clearance checks and compatible fuel rail positioning; confirm fitment in your engine bay before purchase.
A-Team Performance LS Rectangle Port Intake Manifold
Best for complete installation with a 102mm throttle body opening, including fuel rails and a crossover. It’s designed for Chevrolet Small Block Gen III/IV engines ranging from 4.8L to 6.2L, delivering robust airflow and a cohesive kit.
Who it’s for: buyers who want a ready-to-install manifold with all necessary components, simplifying upgrade projects. The black anodized finish also adds a clean engine bay appearance.
Caution: The value depends on matching the throttle body and support hardware; ensure your fuel system and mounting brackets align with the included kit.
LS1/LS2/LS6 102mm High Gen II Intake Manifold
Best for large-volume plenum designs offering significant airflow for LS1/LS2/LS6 family engines. The 9.65L plenum and black finish deliver a stealthy look while maintaining durability through a 3mm thick aluminum construction.
Who it’s for: buyers seeking high-volume air delivery for performance-oriented NA builds. It’s a solid choice for engines requiring a robust air-inlet system and a modern under-hood appearance.
Caution: The higher plenum volume may require tuning changes and clearances with hood lines and accessory belts; verify fitment with your chassis configuration.
Buying Guide: Square Port LS Intake Manifolds
- Port compatibility: Square-port intakes are designed to seal with specific port shapes on LS cylinder heads. Confirm your engine head port type (rectangle vs cathedral) and port matching to avoid gaps and flow losses.
- Intake height and clearance: High-rise or hi-ram designs require more space. Check hood clearance, valve covers, and firewall room before selecting a tall manifold.
- Fuel system compatibility: EFI vs carbureted options require corresponding fuel rails, injectors, and throttle bodies. Choose a model that matches your fuel delivery setup.
- Throttle body size: A larger bore (e.g., 92mm or 102mm) supports higher airflow but may necessitate upgraded throttle cables and intake plumbing.
- Installation kit: Some manifolds ship with full install kits, including gaskets, rails, and hardware. If not, budget for compatible components to ensure a complete install.
- Intended RPM range: Single-plane manifolds typically favor higher RPMs, while dual-plane designs can boost low- to mid-range torque. Select based on intended use: street, strip, or mixed driving.
- Durability and finish: Aluminum manifolds with protective finishes resist heat and corrosion, maintaining performance and appearance over time.
Frequently Asked Questions
- What is a square port LS intake manifold? It is an intake manifold designed to seal against LS cylinder heads with a square or rectangle port pattern, commonly used on LS3, LS7, and related engines to improve airflow.
- Do I need a different manifold for EFI and carbureted engines? Yes. EFI manifolds route fuel through injectors and require rails and throttle bodies, while carbureted manifolds use a different mounting pattern for carburetors and associated fuel delivery components.
- Will a hi-ram manifold fit under a stock hood? It depends on the engine bay and hood height. Hi-ram designs are taller and may require hood clearance checks.
- Is port matching necessary? Port matching is recommended to minimize flow losses. Ensure the port shapes and sizes align with your cylinder heads.
- What RPM range should I expect from a single-plane manifold? Single-plane manifolds typically excel at higher RPM ranges, improving top-end power at the cost of low-end torque compared with dual-plane designs.
- Are installation kits important? Yes. A complete kit with rails, gaskets, and hardware simplifies the install and ensures proper sealing and fuel delivery alignment.