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Intake manifolds for GM LS engines from 4.8L to 6.2L, including LS swap projects. Options cover cathedral-port heads (LS1, LS2, LS6) and rectangle-port heads (LS3, L92), with 4150 carbureted manifolds, EFI manifolds and 92 mm and 102 mm Hi-Ram designs.
Our V8 intake manifolds are cast and CNC-machined in our own factory, then checked for air-tightness, dimensions and finish before they are packed. Orders ship within 24 hours on business days from our warehouses in Ontario, California and Bloomingdale, Georgia.
Which LS engines use which port
• Cathedral port: LS1 and LS6 5.7L, LS2 6.0L, LQ4 and LQ9 6.0L trucks, and most 4.8L and 5.3L truck engines (LR4, LM7, L59, LY2, LH6, LC9, LMG, LY5)
• Rectangle port: LS3, L92, L9H and L99 6.2L, plus L76, L77, LY6 and L96 6.0L
• Not compatible: 2014-and-later Gen V LT engines (LT1, L83, L86 and others) use different heads and direct injection, so LS intakes will not fit.
If your heads have been swapped, go by the heads on the engine, not the engine code. A 6.2L LS (LS3, L92, L99) needs a rectangle-port intake.
How to choose an LS intake manifold
1. Port shape first. LS1, LS2, LS6 and most 4.8/5.3/6.0 truck engines use cathedral-port heads; LS3 and L92 use rectangle-port heads. The two are not interchangeable, so check your heads before anything else.
2. Carburetor or fuel injection. A carbureted 4150 intake has no injector bosses and is the simplest LS swap setup. An EFI intake keeps port fuel injection and needs a fuel rail and an ECU.
3. Hood clearance. Hi-Ram intakes sit much taller than a factory intake and suit cars with a cowl or hood scoop.
| Your build | Good starting point |
|---|---|
| Cathedral port, carb swap, street torque | 300-130 Dual Plane 4150 |
| Cathedral port, carb, more top-end | 300-132 Single Plane 4150 |
| Cathedral port, EFI, 4150 throttle body | 300-137 Single Plane EFI |
| Rectangle port, carb swap, street torque | 300-129 Dual Plane 4150 |
| Rectangle port, carb, more top-end | 300-131 Single Plane 4150 |
| Rectangle port, EFI, 4150 throttle body | 300-136 Single Plane EFI |
| Hi-Ram EFI, cathedral port | 300-122 (92mm) or 300-123 (102mm) |
| Hi-Ram EFI, rectangle port | 300-116 (92mm) or 300-117 (102mm) |
FAQ
How do I tell cathedral port from rectangle port?
Look at the intake ports on the head: cathedral ports are tall and narrow with a pointed top; rectangle ports are wider and square. LS3, L92 and L99 heads are rectangle port.
Which intake fits a 6.2 LS?
6.2L LS engines (LS3, L92, L9H, L99) have rectangle-port heads, so choose a rectangle-port model: 300-129, 300-131, 300-136, or the 300-116 / 300-117 Hi-Ram.
Carb or EFI for an LS swap?
A carb intake is simpler and cheaper to wire; EFI keeps better drivability and fuel economy. See our EFI vs Carbureted LS Intake guide and the LS Carb Intake Manifold Guide.
92mm or 102mm Hi-Ram?
92mm suits most street builds; 102mm suits larger, higher-RPM combinations. The throttle body must match the opening; see our LS throttle bodies.
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