FAST 146602B LSXRT 102mm Intake Manifold for GM 4.8/5.3/6.0L Cathedral Port LS

Regular price: $1,276.95
Regular price
Sale price: $1,276.95

Shipping calculated at checkout.

In Stock: 8

Orders by 1pm PST ship same business day

Free Shipping w/3-4 Day Delivery

Authorized Dealer

Fitment Guarantee

30-Day Hassle Free Returns

Product Specification:

SKU:FST146602B

MPN: 146602B

UPC: 36584263647

Weight: 21.5 lb

Inventory: 8

Type: Intake Manifolds

Vehicle Fitment

GM LS-Series engines with Cathedral Port Heads (4.8L, 5.3L, 6.0L)
Common in GM trucks/SUVs using LS cathedral port engines (e.g., Silverado, Sierra, Tahoe, Yukon, Trailblazer SS)

Features

LSXRT 102 mm intake manifold design for enhanced airflow and horsepower gains
Precision molded polymer construction reduces weight and heat soak compared to stock intake manifolds
Modular design with removable runners allows easy disassembly and porting
Integrated nitrous bungs for performance enhancements
Compatible with FAST 102 mm Big Mouth throttle bodies and many OEM/electronic throttle bodies
Precision bolt-on fit retains factory accessory and fuel/emission connection compatibility
Improved runner layout promotes efficient air distribution across cylinders
Innovative runner design can yield noticeable horsepower gains on stock engines

Specifications

Brand: FAST (Fuel Air Spark Technology)
Part Number: 146602B
Series: LSXRT 102 mm Cathedral Port Intake Manifold
Throttle Body Bore: 102 mm
Material: Precision molded polymer
Port Style: Cathedral port
Fuel Injection: Multi-port EFI compatible
Runners: Removable for porting or modification

Included Components

1x FAST 146602B LSXRT 102 mm intake manifold

Product Description

The FAST 146602B LSXRT 102 mm Intake Manifold is a high-performance replacement for stock intake manifolds on GM LS-series cathedral port engines, such as 4.8L, 5.3L, and 6.0L V8s. Featuring a precision molded polymer design, this intake manifold offers reduced weight and lower heat soak compared to traditional aluminum designs, while promoting better airflow and horsepower potential. The modular LSXRT architecture allows removable runners for easy disassembly and porting, making it ideal for both street and performance builds.

With a 102 mm throttle body bore, the 146602B is optimized for high-flow applications and pairs with FAST's Big Mouth 102 mm throttle body or many OEM electronic throttle bodies with appropriate adapters. Integrated nitrous bungs add expansion potential for performance systems, and the design maintains compatibility with many factory fuel and accessory connections for easier installation. Whether building a stronger street truck or preparing a race-ready LS engine, this manifold provides a functional path to improved intake airflow and performance.