FAST LSXRT Manifold LS3 102MM High HP Runner - Black

SKU: FST146105B

Intake Manifolds, Fuel Injected

FST Intake Manifolds

Fast

FAST LSXRT Manifold LS3 102MM High HP Runner - Black

SKU: FST146105B

Intake Manifolds, Fuel Injected

FST Intake Manifolds

Available from MFR. This item is available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical order processing and release times for this part. This item is not held in our own warehouse, and actual dispatch timing may vary depending on manufacturer workload and logistics at the time of ordering.

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Description

This LSXRT Intake Manifold gives LS3 engines with rectangle-port cylinder heads even more plenum volume for all-out racing. Best suited for high-RPM race engines, this manifold creates proven gains of 30+ horsepower over the FAST LS3 Street Manifold at high RPM. The raised 102mm throttle body location optimizes the larger, less restrictive High HP runner design, creating more power. It also clears truck drive accessories.

Application Summary

Chevrolet: SS 14 - 17 6.2 L Engine, Pontiac: G8 09 - 09 6.2 L Engine, Hummer: H2 08 - 09 6.2 L Engine, GMC: Yukon XL 1500 07 - 09 6 L Engine, Chevrolet: Avalanche 07 - 09 6 L Engine, Pontiac: G8 08 - 09 6 L Engine, Cadillac: Escalade EXT 07 - 13 6.2 L Engine, GMC: Sierra 1500 07 - 13 6.2 L Engine, Cadillac: Escalade ESV 07 - 16 6.2 L Engine, Chevrolet: Corvette 08 - 13 6.2 L Engine, GMC: Sierra 08 - 16 6.2 L Engine, GMC: Sierra 1500 07 - 09 6 L Engine, Chevrolet: Suburban 1500 07 - 09 6 L Engine, GMC: Yukon XL 1500 07 - 14 6.2 L Engine, Chevrolet: Tahoe 08 - 09 6.2 L Engine, Chevrolet: Silverado 1500 07 - 09 6 L Engine, Chevrolet: Camaro 10 - 15 6.2 L Engine, Cadillac: Escalade 07 - 16 6.2 L Engine, GMC: Yukon 07 - 14 6.2 L Engine, Chevrolet: Silverado 1500 09 - 13 6.2 L Engine

Part Type

Engine Intake Manifold

Data: v4.2 - Upd: 2026-09-28 23:57:41

Features

Feature larger plenum than the lower profile LSXr High HP intake manifold.

Specifications

Product Attributes - EGR: No
Product Attributes - UPC: 036584324225
Product Attributes - Brand: FAST
Product Attributes - Notes: This model is designed for high horsepower. Designed for use with Big Mouth 102mm throttle body but can also be used with stock 90mm or 92mm throttle bodies. 78mm three-bolt throttle bodies require an adapter. May require a taller hood.
Product Attributes - Quantity: Sold individually.
Product Attributes - Part Type: Intake Manifolds, Fuel Injected
Product Attributes - Base Color: Black
Product Attributes - Product Line: FAST LSXRT Intake Manifolds
Product Attributes - Base Material: Polymer
Product Attributes - Plenum Finish: Black
Product Attributes - Plenum Material: Polymer
Product Attributes - Runners Included: Yes
Product Attributes - Runners Removable: Yes
Product Attributes - Injectors Included: No
Product Attributes - Fuel Injection Style: Multi-port
Product Attributes - Throttle Body Included: No
Product Attributes - Intake Section Included: Complete
Product Attributes - Throttle Body Bore Size: 102mm
Product Attributes - Engine Block Deck Height: Standard deck
Product Attributes - Manufacturer's Part Number: 146105B
Product Attributes - Supplemental Boss Quantity: Eight
Product Attributes - Cylinder Head Configuration: Rectangular Port LS3/L76/L92/L99
Product Attributes - Supplemental Bosses Cast-In: Yes
Product Attributes - Supplemental Bosses Machined: No
Product Attributes - Aftermarket Fuel Rail Required: Yes
Product Attributes - Multi-Port Fuel Rails Included: No

Reference Information

Brand Name/s	Fast
StreetFX SKU	fst146105B
SFX Item ID	4084471
Supplier Item Code	4084471
Manufacturer SKU	146105B
Manufacturer UPC	36584374725
Alternative References	LS3, 102MM