LS Intake Manifold

LS Intake Manifolds for Cathedral & Rectangular Port Engines

Choosing the right LS intake manifold is mainly about matching the manifold to your cylinder heads, induction system, and intended RPM range. EVIL ENERGY offers LS engine intake manifold options for compatible LS1, LS2, LS6, LS3, L92, L99, L76, 5.3L, 6.0L, and 6.2L engine builds, including carbureted and EFI configurations for street, engine-swap, and higher-RPM applications.

Do not choose an intake manifold by displacement alone. A 5.3 LS intake manifold, for example, still needs to match the actual cylinder-head port and surrounding components. LS1, LS2, and LS6 applications commonly use cathedral-port heads, while many LS3, L92, L99, and L76 combinations use rectangular ports. An LS1-style cathedral-port manifold should not be treated as interchangeable with an LS3 intake manifold.

Which LS Intake Manifold Is Right for Your Build?

• Confirm the Cylinder-Head Port: Identify cathedral or rectangular ports before comparing manifold styles. This is one of the most important fitment checks.
• Choose EFI or Carburetor: Carbureted builds need the correct carburetor flange and linkage, while EFI builds may also require compatible fuel rails, injectors, throttle body, sensors, and wiring.
• Match the RPM Range to How the Engine Will Be Used: Dual-plane and lower-RPM designs are commonly considered for street-focused builds, while single-plane or Hi-Ram manifolds are better evaluated as part of a higher-RPM combination with suitable heads, camshaft, gearing, and fuel system.
• Check Throttle-Body Compatibility: Confirm throttle-body diameter, bolt pattern, bore size, cable or DBW configuration, and available intake-tube clearance. A larger throttle body is not automatically the better choice.
• Check Fuel Rails and Injectors: Review whether fuel rails are included and confirm injector style, injector height, rail fittings, and fuel-pressure requirements. Do not assume the existing rails or injectors will fit every manifold.
• Measure Hood Clearance: Manifold height is not the total installed height. Include the throttle body or carburetor, spacer, fuel rails, fittings, air cleaner or intake tube, and engine movement when checking clearance.
• Check Sensors and Vacuum Ports: Confirm MAP, IAT, PCV, brake-booster vacuum, and other required ports before installation.
• Review What Is Included: Check whether the selected EVIL ENERGY LS intake manifold includes fuel rails, gaskets, bolts, fittings, vacuum hardware, or other accessories. Additional parts may still be required to complete the installation.

Street Build or Higher-RPM Build?

For a street-driven LS engine, focus on the RPM range used most often rather than choosing the tallest or largest manifold available. A manifold intended for a broad low-to-mid RPM range may be a better match for daily driving, weekend cruising, and moderate engine combinations. Higher-rise or single-plane designs should be matched to the cylinder heads, camshaft, compression, gearing, and intended engine speed.

An intake manifold can change airflow characteristics and the engine's effective RPM range, but a specific horsepower increase cannot be guaranteed from the manifold alone. The final result depends on the complete engine combination and, for EFI applications, calibration may be required after changes to airflow, throttle body, injectors, or other engine components.

Check Before Ordering an EVIL ENERGY LS Intake Manifold

Confirm the exact engine family, cylinder-head port, displacement, EFI or carburetor setup, throttle-body or carburetor interface, intended RPM range, manifold height, hood clearance, injector and fuel-rail compatibility, sensor and vacuum-port requirements, and package contents. These checks are more reliable than choosing an intake manifold by the LS engine name alone.