LS3 intake manifolds – Buyer’s Guide!

An intake manifold is essentially a solid cast component made up of many cylindrical tubes that are folded around to deliver a fuel/air mixture to the engine. The intake manifold injects either an optimized fuel/air mixture or indirect injection models, only air into the cylinder heads. The even distribution and amount of air added to the mixture provides differing levels of performance, ranging from stock to racing and heavy-duty hauling.


List of Top-Rated LS3 intake manifolds


PhotoModelYearDimensionsDescription
Edelbrock 2701 Performer2008-201322.4” x 10.6” x 5.7”
View on Amazon
Fast 146302BFast 146302B2008-201324” x 15” x 7”View on Amazon
Holley 300-135Holley 300-1352008-201328.9” x 15.9” x 14.8”View on Amazon
ACDelco 12580420ACDelco 125804202008-201328.25” x 18.12” x12.38”
View on Amazon
Holley 300-136Holley 300-1362008-201323” x 14.5” x 6.9”View on Amazon

Aftermarket intake manifolds are designed to counter the throttle valve restriction found in reciprocating spark ignition piston engines. The added manifold air counters the vacuum produced by the engine, and increases performance, driving power up and improving torque.

Modern performance upgrade manifolds are usually made from cast aluminum and come with a plethora of finishes. Some modern plastic composites that provide thermal and strength benefits at a fraction of the cost are slowly replacing the aluminum models.


The Best LS3 intake manifolds Reviews


Edelbrock 2701 — Performer Intake Manifold

Holley 822101

t is designed for 1986 and earlier 262-400 cubic-inch Chevys. Before purchasing, ensure it fits your vehicle model.

Performance

The Edelbrock 2701 Performer Intake Manifold has a patented dual-plane, low-rise design with a 180-degree firing order that helps to boost torque over a wide RPM range for exceptional throttle response. The runner design is tuned for peak torque at 3500 RPM on a 350-inch engine. This makes it perfect for power from off-idle to 5500 RPM.

The intake manifold is durable since it is made from aluminum with a natural finish. The Dyno-tests shows gains of 5hp and nine ft-lbs of torque compared to Edelbrock 2101 Performer Intake Manifold. It operates at a range between 3000-4500 RPM, allowing power to increase at an average of 5+ ft-lbs of torque for better performance that you need

Features

  • It has a low-rise dual-plane design
  • Made of aluminium with a natural finish
  • 3000-4500 RPM range
  • Single carburetor without EGR

Recommendations

Edelbrock 2701 Performer Intake Manifold is ideal for 1986 and earlier 262-400 cubic-inch Chevys, and it will give you exceptional performance.


Fast 146302B — LSXr 102mm Intake Manifold 146302B

Fast 146302B

This is the Fast polymer LSXR 102mm Intake Manifold for LS engines.

Performance

This Fast polymer manifold is designed to outperform aluminum intake models. This is a black colored polymer that comes with lighter weight, increased strength and improved heat dissipating features that deliver better performance than aluminum manifolds.

Fast 146302B

This model is designed for rectangular port GM LS3 and LS7 engines and will also fit cathedral port LS1/LS2/LS6 engines. This 102mm model features a unique modular design that provides you with a fast and easy disassembly as well as enables you to remove individual runners for porting.

This model also comes with integrated nitrous bungs and accurate bolt-on fitment for factory accessories without modification or clearance concerns.

Features

  • Modular design for fast and easy disassembly
  • Abel to remove individual runners for porting.
  • Constructed from an advanced polymer material.
  • 102mm air inlet
  • Integrated nitrous bungs
  • Precise bolt-on fit

Recommendations

Fast is a leading innovator in modern materials, and this is one of their successful and exceptional performance models that delivers ultra-lightweight performance at a fair price.


Holley 300-135 — LS3 Mid Rise Modular EFI Intake

Holley 300-135

This is the Holley 300-135 LS3 Mid Rise Modular EFI Intake for LS3 applications.

Performance

This Holley LS Modular Mid-Rise Intake manifold is a cast aluminum alloy component used to upgrade for Performance Street or strip applications that come with limited hood clearance. This overall height of this model is only 10.44”.

Holley 300-135

Since the 300-135 has a modular base, you can opt to buy the complete kit that comes in either a 92mm or 105mm EFI throttle body plenum top. You can then add billet fuel rails or use the optional upper plenum adapter. The adapter accepts all of the Holley Hi-Ram plenum tops.

Holley 300-135

This model works in an operating range between 1,500 to 6,500 RPM.

Features

  • Provides great performance for street or strip performance applications
  • A unique modular design combining a traditional dual-plane layout with an EFI manifold plenum
  • Great for supercharged or turbocharged engines
  • Power band from 1500-6500 RPM
  • Cast aluminum construction

Recommendations

This is another perfect performance grade upgrade intake manifold for many LS3 applications and is really priced well.


ACDelco 12580420 — GM Original Equipment Intake Manifold Assembly

Top Street Performance 81003

ACDelco 12580420 GM Original Equipment Intake Manifold is designed to fit GM vehicles and other models. Before you proceed to buy the product, ensure it fits your vehicle.

Performance

The unit will meet your needs and expectations for form, fit, and function. It evenly distributes the incoming engine air to every cylinder. This ensures that only the correct amount of air mixes with the right amount of fuel.

This intake manifold ensures that it provides you with the same performance, service life, and durability that you will be happy about.

Features

  • Replacement part for GM vehicle’s original factory component
  • Build to GM OE specification for form, fit, and function
  • It’s durable
  • Offers the same performance as the original product

Recommendations

The product has a standard price, making it affordable to many people. It will also provide you with the quality, reliability, and superior performance that you need.


Holley 300-136 — LS3/L92 Single Plane EFI Intake Manifold

Holley 300-136

This is the Holley 300-136 LS3/L92 Single Plane EFI Intake Manifold

Performance

The Holley 300-136 is a spider-like an intake manifold that delivers a 2,500-7,000 RPM broad powerband of performance. This model weighs only 11.5 lbs, so you get that added lightweight performance too. This model uses an LS Single Plane Mid-Rise design and works with both carbureted and EFI applications.

The runner design of the intake manifold utilizes airflow to improve cool air reduction, and the wall thickness of the aluminum supports faster thermal temperature control.

This model is designed as an ultra-low model; the port sizes are 2.50″H x 1.15″W, and the Carb Mounting Flange Height from Lifter Valley Cover Flange is only 5.42″.

Features

  • Designed for performance LS engines with a 2,500-7,000 rpm power band
  • Cast aluminum construction with a consistent wall thickness
  • Accepts a carburetor/throttle body with a Holley 4150 square bore flange
  • Available with machined ports for EFI installation
  • The lowest carb flange height around
  • Matching black anodized billet fuel rails for EFI manifolds

Recommendations

This is a budget-friendly beast of a performance, and it actually outperforms many more expensive models. This is an exceptional intake manifold and is designed for work not show.


What LS stands for?


LS Engines

GM first introduced its LS V8 engine in 1970. This engine was a completely new design and only had its rod bearings, lifters, and bore spacing parts that were shared with the older Chevrolet small-block V8. The first and basic LS variations used cast iron blocks, and the performance models were cast out of aluminum alloy and had cast-iron cylinder liners.

There are three generations of LS small-block engines, and they are II, IV and V. The latest generation V is, in fact, an LT1 designated model, and it was introduced in 2014.

There are many versions of the LS models, and the LS3 first appeared in 2008 in the Corvette. This initial LS3 model provided 430 bhp (321 kW; 436 PS) at 5900 rpm and 424 lb/ft (575 N/m) at 4600 rpm.

The LS3 block replaced the LS2 and came with a 103.25 mm (4.065 in) bore which delivers a 6,162 ccs (6.2 L; 376.0 cu in) displacement. The cylinder heads are higher coming from the L92, and it comes with 0.551 in (14 mm) lift, a 10.7:1 compression ratio camshaft. The valvetrain comes with 0.236 in (6 mm) offset intake rocker arms, and the factory intake manifold is a high-flow model.

The LS3 cylinder heads use 2.165 in (55 mm) intake valves, and 1.59 in (40 mm) exhaust valves, but these also limit the maximum RPM to 6600.

About the author

Glenn Freeman

The eagle-eyed autosports journalist, guest commentator, the proud owner of GMC Sierra 1500, auto parts & auto repair consultant. You can follow him on Twitter

Leave a Comment