Performance Intake Manifolds

What Performance Intake Manifolds Do

Performance intake manifolds distribute airflow to every cylinder and control how fast that air moves into the ports. Runner design is the main tuning lever. Longer, narrower runners keep air velocity high for low-end and mid-range torque, while shorter, larger runners favor high-rpm horsepower.

Plenum volume matters too. A larger plenum helps feed a high-revving engine, but it can soften throttle response on a mild street combination. That's why you should choose an aftermarket intake manifold as part of the whole package, including cam timing, cylinder heads, displacement and gearing.

For a closer look at how runner cross-section and length change the powerband, read our breakdown of intake manifold runner size. Bigger runners aren't automatically better, especially on a smaller engine that rarely sees high rpm. When you're ready to plan the rest of the system, browse our air and fuel delivery parts for carburetors, throttle bodies, fuel pumps and filters.

Single Plane Vs Dual Plane Intake Manifolds

A dual plane intake builds low-end and mid-range torque, while a single plane intake trades some bottom end for high-rpm power. Dual plane designs divide the plenum into two halves, and each half feeds four cylinders through longer runners. That layout suits street cars, tow vehicles and automatic combinations with stock converters.

A single plane intake uses one open plenum that feeds all eight runners. It suits track cars with bigger cams, higher-stall converters and steeper gears that keep rpm up.

Common intake styles in this category include:

• Dual plane intakes for low-end and mid-range torque on street and towing builds
• Single plane intakes for high-rpm power on strip and race engines
• High-rise and tunnel ram intakes for race combinations that often need a hood scoop
• EFI multi-port intakes with injector bosses in each runner
• Fabricated sheet-metal intakes for dedicated race engines

If you're still deciding, our single plane vs dual plane intake guide compares both designs in more detail.

Choosing An Intake Manifold By Engine Platform

Start with your engine family, then match the manifold to your cylinder head port shape. A small block Chevy (SBC) intake manifold won't bolt to a big block, and an oval-port big block intake won't match rectangle-port heads. LS engines add another split between cathedral-port and rectangle-port heads.

For big block Chevy oval-port heads, the Edelbrock RPM Air-Gap is a dual plane option for street performance. Brian Tooley Racing BTR Trinity intakes cover GM LS3, LS7 and Gen V LT engines, plus the 6.2L HEMI and Ford Godzilla. If you're shopping for an LS intake manifold for an EFI build, the FAST LSXHR is another option in this category.

Before you order, check the carburetor or throttle body flange, hood clearance, and vacuum and coolant port locations. Use the JEGS vehicle fitment tool to filter parts for your vehicle. You can also call JEGS Tech Specialists to confirm your manifold, heads and induction system work together.

Carbureted Vs EFI Intake Manifolds

A carbureted intake manifold carries both air and fuel, while an EFI intake manifold carries mostly air and sprays fuel near each intake valve. Because a carbureted runner moves a fuel mixture, its shape affects fuel distribution as well as airflow. Port-injected EFI manifolds avoid most of that issue, which gives designers more freedom with runner length.

On a carbureted build, match the manifold flange to your carb. A square-bore 4150 flange won't accept a spread-bore carburetor without an adapter, and plenum height affects hood clearance. Our high rise vs low rise carbureted intake guide compares rise height options for carbureted engines.

EFI conversions and late-model engines need injector bosses, a throttle body flange and sensor provisions that match your system. For 5.0L Ford EFI engines with Cobra or GT-40 intakes, Ford Performance offers an EFI heat spacer that helps reduce heat transfer into the intake.

Intake Manifold Components, Spacers And Valley Plates

Spacers, plates and hardware let you fine-tune or adapt the manifold you already run. Phenolic heat spacers reduce heat transfer from the engine into the carburetor, and open spacers add plenum volume. Billet-aluminum LS spacers and tall-deck plates help adapt intakes to blocks with raised deck heights.

Common intake manifold spacers and add-on parts include:

• Phenolic heat spacers that insulate the carburetor from engine heat
• Billet-aluminum spacers that raise LS intakes on tall-deck blocks
• Plug kits that seal unused vacuum, sensor or injector ports
• Replacement runners for modular intake designs

Shop our intake manifold components for these parts and related install hardware. On LS engines, lifter valley plates and covers seal the lifter valley beneath the intake manifold. Chevrolet Performance offers LS valley covers for factory-style builds and engine swaps.

Whichever parts you choose, confirm that each spacer or plate matches your manifold bolt pattern and port style.