Best Intake For Ls1: Compare Cathedral-Port Manifolds

#1 · Best Overall

1. FAST LSXr 102mm

• Weight: 19.45 lb

Best for: Polymer intake upgrade seekers.

Why it ranks #1: Its 102mm inlet, longer runners, and removable runner design suit airflow-focused cathedral-port builds; it can also work with OEM or aftermarket 90mm or 92mm throttle bodies.

FAST combines a 102mm air inlet with longer runners in its LSXr manifold, a pairing intended to increase airflow while maintaining low-RPM torque. Its advanced polymer construction also makes the assembly lighter than aluminum and cooler-running, giving LS1, LS2, and LS6 owners a distinct alternative to an aluminum intake.

Longer, less-restrictive runners and a larger-than-stock inlet connect the airflow emphasis to the manifold’s stated power and low-RPM torque aims. The removable runner design lets a builder disassemble the intake for porting, useful when customization is part of the workflow. FAST identifies the polymer construction as lighter than aluminum and cooler-running. The 102mm inlet suits FAST’s Big Mouth 102mm throttle body and can also be used with OEM or aftermarket 90mm or 92mm throttle bodies.

Skip it if you need a 90mm or 92mm inlet; FAST also lists LSXr options in those sizes.

This FAST LSXr suits LS1, LS2, and LS6 builders seeking a 102mm inlet, removable runners for porting, and polymer construction. Consider throttle-body size and available installation space before choosing its larger-than-stock opening.

Listed on Amazon as: FAST LSXr 102mm Intake Manifold for LS1, LS2, and LS6 (146302B), black

#2 · Included Fuel Fittings

2. GSTP 92mm Aluminum Manifold

• Weight: 17.51 lb
• Package Dimensions: 21.4 x 15.5 x 11 in

Best for: 92mm aluminum EFI builds.

Why it ranks #2: This 92mm cathedral-port EFI manifold lists vacuum ports, a rear MAP port, 8AN fuel-rail fittings, and an upgraded bracket for original LS1, LS2, or LS6 injectors.

GSTP specifies a 92mm inlet in 1/8-inch-thick T6061 aluminum, giving this cathedral-port LS manifold a defined opening and material for an EFI build. Its vacuum ports, rear MAP port, and 8AN fuel-rail fittings add connection points that can help organize the intake-side installation around the listed hardware.

The 92mm inlet and 210mm height provide two key dimensions to consider when planning throttle-body selection and engine-bay packaging. GSTP lists 1/4NPT and 1/8NPT vacuum ports with plugs, plus a rear M12 x 1.25 MAP port, giving builders specified connection locations for the listed setup. Its upgraded fuel-rail bracket is stated to accept original LS1, LS6, or LS2 injectors without additional spacers or modifications, simplifying that particular injector arrangement.

Skip it if you need a 102mm inlet; the GSTP manifold listed here has a 92mm opening.

This GSTP manifold suits cathedral-port LS EFI builders who want a 92mm inlet, specified vacuum and MAP ports, and support for original LS1, LS6, or LS2 injectors. Account for its 210mm height and inlet size when planning the installation.

Listed on Amazon as: For LS LS1 LS2 LS6 Intake Manifold with Cathedral Port Compatible with Chevy 4.8 5.3 5.7 6.0 L (92MM Silver)

#3 · Cable-Drive Option

3. Htostar Racing 102mm Manifold

• Weight: 20.2 lb
• Package Dimensions: 24.5 x 16 x 10.7 in

Best for: Cable-throttle cathedral-port builds.

Why it ranks #3: Its 102mm inlet and cathedral-port LS1 compatibility are relevant for cable-drive setups, but the listing specifically excludes drive-by-wire applications.

A 102mm inlet paired with a 210mm-tall manifold gives this Htostar Racing intake a larger entry opening and a taller package for compatible cathedral-port LS builds. Its stated cable-drive-only configuration narrows the choice to engines using that throttle setup, rather than drive-by-wire applications.

The manifold is listed for LS-based engines with cathedral-port heads, including 4.8L, 5.3L, LS1, LS2, and LS6 applications, making those engine families its intended scope. The 102mm inlet gives builders a broad throttle-body opening to work with, while the 210mm height is an important packaging measurement to account for during an installation. Its four-bolt intake is specified for cable drive only, so that throttle arrangement is a firm compatibility boundary.

Skip it if you have a drive-by-wire throttle body; this manifold is specified for cable drive only.

Choose this Htostar Racing manifold for a cathedral-port LS build using a cable-driven throttle body and a 102mm inlet. Its 210mm height also matters when planning engine-bay clearance, and drive-by-wire setups are outside its stated compatibility.

Listed on Amazon as: For LS Intake Manifold Compatible with LS1 LS2 LS6 of cathedral port heads with Drive by Cable Throttle Body Compatible with Chevy Cadillac Pontiac Aluminum (102mm)

#4

4. POSENG 102mm Black Manifold

• Weight: 16.87 lb
• Package Dimensions: 23.3 x 14.1 x 10 in

Best for: Black 102mm LS intake buyers.

Why it ranks #4: The 102mm version is listed for original LS1, LS2, and LS6 engines with cathedral-port heads; the seller notes that additional modifications may be required.

This black POSENG manifold combines a 102mm inlet with cathedral-port compatibility for LS1, LS2, and LS6 heads, giving builders a clear opening size and engine family to assess. Its listed vehicle applications span several Chevrolet, Pontiac, Cadillac, and Saab models, while the seller notes additional modifications may be required.

The 102mm designation is the key intake dimension for planning the throttle-body side of the installation, and the black version is identified in the title. POSENG lists compatibility with cathedral-port LS engines and names specific Corvette, Firebird, Trans AM, CTS, SSR, TrailBlazer SS, GTO, and Saab applications. The listing’s note that additional modifications may be required makes the fitment list a starting point rather than a guarantee of an unchanged installation for every vehicle.

Skip it if you need a stated no-modification installation; this listing warns that additional modifications may be required.

This POSENG manifold suits cathedral-port LS1, LS2, or LS6 builders seeking a black 102mm intake and a listed vehicle application. Review the stated modification caveat alongside the specific engine and vehicle fitment before planning installation.

Listed on Amazon as: Intake Manifold for LS Cathedral Port Heads for LS1 LS2 LS6 LS Engines Compatible with Chevy 4.8 5.3 5.7 6.0 HTRACING (Black 102MM)

#5

5. PUZZLEDEER 92mm Manifold

• Weight: 17.61 lb

Best for: Silver 92mm manifold shoppers.

Why it ranks #5: This 92mm intake is listed for LS1, LS2, and LS6 cathedral-port applications and several compatible vehicles, making it a standard-size alternative to 102mm options.

A 92mm inlet sets this silver PUZZLEDEER manifold apart from the larger 102mm choices in this group, giving cathedral-port LS builders a more specific opening size to plan around. The listing identifies LS1, LS2, and LS6 engines among its intended applications and explains the manifold’s role in distributing intake air to the cylinders.

The product description says the manifold distributes incoming air to each cylinder, connecting its core function to the cylinder-head installation point. Its stated 92mm size gives the buyer a concrete inlet dimension for planning the intake setup, while the silver finish identifies the listed version. Fitment information names LS cathedral-port applications and several Chevrolet and Pontiac vehicles, but the supplied vehicle list is incomplete, so the engine and port specifications are the clearest stated selection criteria.

Skip it if you need a fully specified vehicle-application list; the supplied fitment details here are incomplete.

Consider this PUZZLEDEER manifold if a silver 92mm intake for a cathedral-port LS build matches your plan. The listing names LS1, LS2, and LS6, but its incomplete vehicle list leaves application verification as a necessary selection step.

Listed on Amazon as: Intake Manifold for LS Cathedral Port Heads for LS1 LS2 LS6 LS Intake Manifold Engines for Chevy 4.8 5.3 5.7 6.0 Silver 92MM ls intake manifold

#6

6. POSENG 92mm Manifold

• Weight: 20.5 lb
• Package Dimensions: 23.5 x 15.5 x 11 in

Best for: Cable-drive LS manifold shoppers.

Why it ranks #6: It targets cathedral-port LS1, LS2, and LS6 engines and specifies cable-drive-only fitment; its 92mm inlet suits buyers not seeking a 102mm opening.

POSENG specifies a cathedral-port LS manifold for four-bolt cable-drive throttle setups, making throttle type its clearest fit boundary. The listing names LS1, LS2, and LS6 along with several LS-based engine sizes, and notes that LS1 or LS6 injectors are the direct injector fitment specified for this version.

The stated engine range covers LS-based Gen III and IV cathedral-port applications, including 4.8L, 5.3L, 5.7L, and 6.0L engines. Its cable-drive-only note rules out drive-by-wire arrangements, so buyers can screen compatibility before planning the installation. POSENG identifies LS1 and LS6 injectors as supported; other injectors may require mounting-bracket changes, such as extra holes, or spacers. That injector qualification makes this listing especially relevant to builders retaining the named injector type.

Skip it if you use injectors other than LS1 or LS6 and want to avoid bracket changes or spacers.

Choose this POSENG manifold for a cable-drive cathedral-port LS build using LS1 or LS6 injectors. Its stated engine and vehicle applications are broad, but alternate injectors may need bracket work or spacers, and drive-by-wire is excluded.

Listed on Amazon as: For LS LS1 LS2 LS6 Intake Manifold Compatible with Chevy 4.8 5.3 6.0 6.2 with 92mm Throttle Body Kits HTRACING

#7 · Low-Profile Fabricated

7. YIUIY Low-Profile Manifold

• Weight: 18.41 lb
• Package Dimensions: 21.5 x 15.25 x 11 in

Best for: Low-profile fabricated intake buyers.

Why it ranks #7: The 92mm fabricated EFI manifold uses 1/8-inch T6061 sheet aluminum and is described as low profile, a distinct option for cathedral-port LS builds.

YIUIY’s low-profile, fabricated 92mm intake uses 1/8-inch T6061 sheet aluminum with TIG-welded construction, distinguishing it from cast manifold options. It is listed for cathedral-port LS1, LS2, and LS6 heads, giving builders a defined engine family and inlet size to weigh when planning a fabricated EFI setup.

The low-profile description and 92mm opening give buyers two useful dimensions to consider when choosing an intake for a specific engine bay and throttle-body arrangement. YIUIY identifies 1/8-inch T6061 sheet aluminum and TIG-welded fabrication, specifying how the manifold is constructed rather than presenting it as a cast part. Its stated fitment covers cathedral-port LS1, LS2, and LS6 heads and names several Chevrolet, GMC, and Pontiac applications, including Corvette and Firebird models.

Skip it if you need a listed fuel-rail package or injector-bracket details; those items are not specified for this manifold.

Consider this YIUIY intake for a low-profile, fabricated 92mm setup on a cathedral-port LS1, LS2, or LS6 build. Its sheet-aluminum TIG-welded construction is clearly stated, but fuel-rail and injector details are not.

Listed on Amazon as: For LS Intake Manifold Low Profile Cathedral Port 92mm Compatible with Chevy GMC Pontiac LS1 LS2 LS6 Sheet Metal Fabricated EFI (Black)

#8 · Large-Engine Builds

8. DEEPMOTOR 102mm Casting

• Weight: 30.2 lb
• Package Dimensions: 24.94 x 16.43 x 13.04 in

Best for: Stroker and boost-oriented builds.

Why it ranks #8: Its 102mm cast-aluminum manifold includes fuel rails and is described for 400-plus CID stroker engines and aggressive heads-and-cam combinations.

DEEPMOTOR pairs cast aluminum runners and plenum with a 102mm throttle-body opening, and includes fuel rails, targeting builds that need a substantial intake package. Its listing specifically names 400-plus-cubic-inch stroker engines, aggressive heads-and-cam combinations, and naturally aspirated, nitrous, or remote-intercooled boost applications.

The included fuel rails and -8 AN fittings provide stated fuel-system hardware alongside the cast aluminum intake, while the 102mm opening sets the throttle-body size the assembly accepts. DEEPMOTOR also specifies a billet CNC plenum volume cap and an individual 1/8-inch or 1/16-inch NPT nitrous/methanol injection port, giving builders listed provisions for those setups. The product is described for several power-adder approaches, but its 30.2-pound listed weight is worth including in handling and installation planning.

Skip it if you want a lighter intake to handle during installation; this assembly is listed at 30.2 pounds.

Choose the DEEPMOTOR casting for a performance build needing a 102mm opening, included fuel rails, and a listed nitrous or boost application. Its substantial 30.2-pound weight is a practical handling consideration during installation.

Listed on Amazon as: LS1/LS2/LS6 102mm Casting Bolted Intake Manifold with fuel rail (Black)

#9

9. JGhyperX 300-130 Carb Manifold

• Weight: 15.22 lb

Best for: Carbureted cathedral-port conversions.

Why it ranks #9: This is a carbureted, dual-plane cathedral-port intake with a stated 1,500–6,500 RPM range, rather than an EFI manifold for a conventional LS1 setup.

Unlike the EFI-focused LS manifolds in this roundup, the JGhyperX 300-130 is explicitly a dual-plane carbureted intake for cathedral-port LS engines. Its stated 1,500–6,500 RPM operating range gives conversion builders a defined range to consider, while its 5.60-inch height is a key packaging measurement.

The dual-plane design and listed 1,500–6,500 RPM range identify this manifold’s intended operating character for a carbureted setup, rather than an EFI intake arrangement. JGhyperX names LS1, LS2, and LS6 engines and Gen III 5.7L and Gen IV 4.8L, 5.3L, and 6.0L applications. Its aluminum construction and 5.60-inch height are practical installation details; the listing also specifies no EGR, an important boundary for buyers whose setup requires EGR.

Skip it if you need an EFI intake; the JGhyperX 300-130 is listed as carbureted and has no EGR.

This JGhyperX fits a cathedral-port LS conversion using a carburetor and a dual-plane intake, with a stated 1,500–6,500 RPM range. Check the 5.60-inch height and no-EGR specification against the planned engine-bay and emissions setup.

Listed on Amazon as: 300-130 LS Cathedral Port Carb Intake Manifold for LS1 V8 Silver

#10

10. RiAiCiING LS Swap Cold Air Intake

Best for: LS swap intake-clearance planners.

Why it ranks #10: This is a cold-air intake system, not an intake manifold; it is listed for LS swaps and supports speed density or round MAF sensors.

A driver- or passenger-side filter position gives this RiAiCiING cold-air intake flexibility when arranging an LS swap around nearby components. The listing says it is intended to provide maximum clearance between the radiator and accessory pulleys, and supports speed-density or round-MAF configurations, making layout a central selection consideration.

Its universal design is listed for most LS1, LS2, LS3, LQ4, LQ9, LY6, 4.8, 5.3, 5.7, and 6.0 engines, with LS swap projects specifically mentioned. Choosing either driver- or passenger-side filter placement can help match the intake route to the available radiator and accessory-pulley clearance. Speed-density and round-MAF use are supported, but the listing notes that a MAF setup requires additional couplers and clamps, which buyers must account for in the installation workflow.

Skip it if you need a round-MAF installation with all couplers and clamps included; the listing says those parts are additional.

This RiAiCiING kit suits LS swap builders who need filter-position choice and clearance around the radiator and accessory pulleys. It supports speed density directly and round MAF with additional couplers and clamps, so plan accordingly.

Listed on Amazon as: 4'' LS Swap Cold Air Intake for LS1 LS2 LSX Camaro Chevelle