LS and LT Intake Manifold FAQ

Select LS3-style manifolds target compatible rectangular-port LS applications such as LS3, L99, L92 and L76; verify the exact manifold, cylinder heads and installation notes. See the billet LS and LT intake manifolds.

Do not assume it does. Confirm whether the manifold is designed for rectangular-port or cathedral-port heads before ordering.

Use the cylinder-head casting and an inspection of the intake-port shape, then compare them with the manifold's specified head family. Vehicle model alone is not sufficient on a swapped engine.

They help identify a rectangular-port family but do not confirm every installation detail. Verify exact head, engine, accessory, fuel and throttle-body compatibility.

Yes. Granatelli offers select billet intake manifolds for compatible GM Gen V LT applications; verify the exact engine and manifold part number.

LS and LT engines have different intake and fuel-system configurations. Use a manifold specifically listed for your engine family.

Compatibility depends on the specific manifold and engine configuration. Verify the Granatelli part number and its listed LT1, L83 or L86 applications.

Yes. Select manifold configurations can be considered for naturally aspirated builds when fitment and airflow requirements match; compare your engine combination with the product specifications.

Select manifolds are intended for performance combinations, including forced induction where the specific product is suitable. Confirm fuel, pressure and installation requirements for your exact build.

Potentially, but an engine swap changes hood clearance, wiring, fuel-system and accessory requirements. Check those dimensions and the intake's engine-head compatibility.

Send the engine code, head port style, vehicle or swap details, hood clearance, fuel system, throttle body and exact manifold part number.

Choose a body compatible with the manifold's flange and opening and appropriate for your airflow target. Check the exact manifold and throttle-body part numbers together. See Granatelli throttle bodies.

Only if the manifold's flange, opening and required adapters match that factory throttle body. Review the listing for supported configurations.

Do not assume that it does. Review the exact product listing to confirm which components are included and which are sold separately.

Select billet manifold configurations offer twin-throttle-body options. Verify the exact manifold variant, throttle-body sizes and required engine-management setup.

Compare engine airflow goals, available packaging, manifold options and ECU control requirements. The correct configuration depends on the complete build rather than throttle-body count alone.

Use the manifold's intended flange arrangement and consider cable or wiring reach, charge piping and blade clearance. Do not rotate a component into a position the product does not support.

Included hardware varies by manifold package. Check the product description or contact support with the part number before purchasing additional fuel-system parts.

Not necessarily. Injector spacing, mounting height and fuel-system type vary; consult the manifold's component list and fitment notes.

No. Throttle-body size and fuel-rail fitment are separate specifications. Match each component to the exact manifold and engine configuration.

Injector angle affects rail alignment, seal engagement and interference with nearby parts. Use the injector and rail configuration specified for the exact manifold.

Dry-fit the rails, injectors and nearby accessories before plumbing fuel lines. Confirm that fittings and hoses remain clear of hot and moving components.

Yes. A dual-injector arrangement needs a fuel-control strategy and hardware matched to the engine and injectors. Consult a qualified tuner before ordering components.

Only if the manifold manufacturer specifies suitable plugs and sealing procedures for that configuration. Never leave unused fuel or manifold openings exposed.

Hood and accessory clearance varies by vehicle, engine mounts and manifold configuration. Compare product dimensions with your available space before ordering.

Measure hood, firewall, brake-booster, fuel-rail and intake-tube clearance with the engine in its installed position. Account for mounts and engine movement.

The installed engine angle, mounts and chassis determine actual clearance. Measurements on a stand do not capture hood, cowl or accessory interference.

Yes. Accessory relocation can change available space around the throttle body, rails and intake pipe. Measure the installed accessory layout before ordering.

Use the gaskets and sealing method specified by the manifold's installation instructions. Do not assume the original gaskets can be reused.

Follow the gasket manufacturer's reuse instructions. Replace any gasket with damage, deformation or an uncertain sealing condition before final installation.

Not automatically. Thread engagement, bolt length and gasket requirements can differ. Verify the fastener specification for the actual heads and manifold.

Use the installation instructions for the exact manifold and engine. Contact technical support with your manifold part number if the torque specification is not provided. Instruction sheets are on our Instructions page.

Inventory the brake booster, PCV, MAP and other required systems, then compare their needs with the exact manifold's available ports. Use correctly rated fittings and follow the vehicle's emissions configuration.

Provide the intake part number, port thread or fitting specification, required hose size and the system being connected. Do not assume all threaded ports are interchangeable.

Compare sensor style, bore, retainer and connector with the manifold's specified mounting provision. Do not machine the manifold or force a mismatched sensor without product-specific guidance.

You can trial-fit it, but do not operate the engine until fuel rails, injector seals, lines and controls are specified and verified for the application.

A manifold change can alter airflow and fueling requirements, especially on modified engines. Check the product instructions and have a qualified tuner evaluate the finished combination.

Confirm manifold application, pressure suitability, gasket retention, charge-pipe routing and fuel-control compatibility. Use the installation specifications for the exact part number.

A controlled leak check by a qualified technician can identify plumbing and seal issues before loaded testing. Use only the pressure and method appropriate for the specific components.

Possible sources include an incorrect gasket, unsealed port, uneven fastener tightening or a mismatched accessory fitting. Inspect the assembly and confirm with a suitable diagnostic test.