FAST 146303 Lsxhr Intake Manifold Gm Ls Cathedral Port 103MM Engines

( Brand: Fast ), ( Part Type: Intake Manifold Engine ), ( Air Freight Prohibited: False ), ( Not Carb Approved: True ), ( Manufacturer Part Number: 146303 )

Review FAST Lsxhr 103mm Intake Manifold Gm Ls Cathedral Port Engines

The 146303 LSXHR 103mm Intake Manifold, manufactured by Holley, is a high-performance aftermarket intake solution designed specifically for the GM LS family of Cathedral Port engines. This intake manifold offers several advantages over the stock intake manifold, delivering improved airflow, increased power, and enhanced drivability.

The manifold features a 103mm bore size, which is larger than the stock manifold's 95mm, allowing for a more significant volume of air to flow through the engine. This improved airflow translates to increased horsepower and torque gains. The manifold is also designed with a rectangular port shape, which optimizes airflow and fuel distribution for better combustion efficiency.

One notable feature of this intake manifold is its unique runners design, which allows for better port velocity and increased power output. Each runner is meticulously designed to minimize turbulence and maximize airflow, resulting in a more efficient combustion process. Additionally, the manifold comes with a 650cfm Holley 4160-style carburetor mounting pad, making it easy to install and use with popular carburetor setups.

Another advantage of the 146303 LSXHR Intake Manifold is its durability. It is constructed from high-quality aluminum, ensuring it can withstand the rigors of high-performance driving. The manifold also comes with a set of gaskets and hardware, making the installation process straightforward and hassle-free.

In summary, the 146303 LSXHR 103mm Intake Manifold by Holley is an excellent upgrade for those seeking improved performance and power from their GM LS Cathedral Port engine. Its larger bore size, optimized runner design, and durable construction make it a top choice for enthusiasts and racers looking to maximize their engine's potential.

Pros and Cons of Buying a 146303 LSX HR 103mm Intake Manifold for GM LS Cathedral Port Engines

The 146303 LSX HR 103mm Intake Manifold is an aftermarket intake manifold designed for GM LS Cathedral Port Engines. This intake manifold offers several advantages over the stock intake manifold, but it also comes with some drawbacks. In this article, we will discuss the pros and cons of buying this intake manifold.

1. Increased Airflow: The 146303 LSX HR Intake Manifold is designed to provide increased airflow to the engine, resulting in better horsepower and torque.

2. Improved Engine Performance: With the increased airflow, the engine performance improves, providing better throttle response, improved idle quality, and smoother engine operation.

3. Better Fuel Economy: The improved airflow and engine performance can lead to better fuel economy, as the engine operates more efficiently.

4. Customizability: Aftermarket intake manifolds offer more customization options, allowing enthusiasts to tailor the intake system to their specific engine build and performance goals.

1. Cost: Aftermarket intake manifolds, such as the 146303 LSX HR Intake Manifold, can be more expensive than stock intake manifolds.

2. Installation Complexity: Installing an aftermarket intake manifold can be more complex than installing a stock intake manifold, requiring additional time, tools, and expertise.

3. Potential for Leaks: Aftermarket intake manifolds may have a higher likelihood of leaks due to the custom nature of the design and manufacturing process.

4. Potential for Engine Misfire: The increased airflow and customization options can lead to engine misfires if not properly tuned, requiring additional time and expense to diagnose and correct.

The 146303 LSX HR 103mm Intake Manifold offers several advantages, including increased airflow, improved engine performance, better fuel economy, and customizability. However, it also comes with some drawbacks, such as cost, installation complexity, potential for leaks, and engine misfire.

If you are looking to significantly improve the performance of your GM LS Cathedral Port Engine, the 146303 LSX HR Intake Manifold is a worthwhile investment. However, it is essential to consider the cost, installation complexity, and potential risks before making the purchase. It is recommended to work with a professional mechanic or performance specialist to ensure a successful installation and proper tuning of the intake manifold.

Details:

FAST LSXHR 103mm Intake Manifold For GM Fits LS Cathedral Port Engines: The is engineered to maximize power output for boosted and naturally aspirated cathedral port engines, including 4.8, 5.3, 6.0 model's. The FAST LSXHR manifold is a proven solution for racers and enthusiasts seeking reliable, high-performance intake systems tailored GM LS cathedral port engines. Cannot be shipped by ground; air. The reversible top design enables forward or firewall-facing throttle body mounting, providing installation versatility.

Smaller items may be shipped in an appropriate envelope using either USPS, UPS or FedEx. This flexibility makes it ideal for racing and high-performance street applications. Constructed from lightweight, durable polymer, this manifold effectively reduces heat soak commonly seen with aluminum counterparts, ensuring consistent performance under demanding conditions. Typical items are shipped in an appropriate box via UPS.

Our Favourite Brands. Its design is optimized to deliver peak power within the 5,000 7,500 RPM range, with testing indicating gains of over 20 horsepower compared standard tunnel ram intakes. The manifold ships with a set of tall removable velocity stacks, allowing users to customize runner lengths for optimal tuning and performance, while optional medium short stacks are available separately further experimentation. The intake features a 103mm throttle body opening, which can be port-matched to 105mm for increased airflow, and includes custom fuel rails along with all necessary hardware installation.

part #: 146303 prices

• $1309.43-$1418.55

specifications inputmanifolds:

• brand: Fast
• part type: Intake Manifold Engine
• air freight prohibited: False
• not carb approved: True
• manufacturer part number: 146303

shipping inputmanifolds:

• class: Standard
• type: Fixed
• transit: 3-7 Days
• carrier: UPS
• cost: $0.00
• service: UPS Ground

seller inputmanifolds:

• rating: 96.8%
• # reviews: 986
• city: Frisco

offer inputmanifolds:

• started: July 28, 2025
• options: Ship-to-home
• availability: In Stock
• sold: 0
• quantity: 2

payments inputmanifolds:

• wallet: Apple-pay
• other
• credit card: Visa

general inputmanifolds:

• Car Truck Parts Accessories > Air Fuel Delivery > Intake Manifolds
• condition: New

returns inputmanifolds:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

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