LSX Performance Intake Manifold Kit

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This is a complete bolt-on intake manifold kit for any Gen-3, cathedral port LS/Vortec series engine. This kit not only improves the look of your engine bay but also increase horsepower and torque. 

Tested up to 23psi boost on a Vortec 6.0 with hot cam, and 75lb injectors, this setup (102mm, high ram) made over 35hp gains when compared to a stock LS1 intake manifold. 

High Rise Manifold Styles for Chevrolet LS / Vortec Fuel Injected Engines

High-Rise (9" Height): Recommended for LS / Vortec with larger displacement and high horsepower / forced induction. Our High profile design has a bold appearance and maximizes horsepower in the higher end, and much more consistent torque levels throughout the power band. Please check your hood clearance before you purchase. 

Low-Rise Intake Manifold Styles for Chevrolet LS / Vortec Fuel Injected Engines

Low-Rise (xx" Height): Virtually the same height as an OEM LS1 style intake. This manifold has increased torque and horsepower levels over stock throughout the entire power band. Recommended for low clearance hoods and N/A engine builds. (Also tested at 23psi boost).


This Fuel Rail Kit allows you to run Vortec LS6 and LS1 style injectors. Increased rail size with more flow and capacity over OEM. All fittings and hardware included.

*Does not fit OEM manifold
*Recommended use with Grassroots Intake Manifold
CNC-Machined Billet Aluminum
1/2" Inside Diameter Ports 


Grassroots Performance LS/VORTEC series throttle body use the 4-bolt mount pattern. A simple proven design that increases airflow with a bigger opening, also known as "BIG MOUTH". Improved horsepower and torque from 2500rpm through redline. OEM fitment for Throttle Position Sensor (TPS) and Idle Air Control Sensor (IACS).

*Fits OEM Manifolds with 4-bolt flange
*Cable Throttle




Vortec Gen-III

4.8, 5.3, 6.0

LR4, LM4, LM7, L33, LQ4, LQ6

Cathedral Port head

Cable Throttle ONLY

LSX 102MM Aluminum Intake Manifold

LSX 102MM Cable Throttle Body

LSX Billet Fuel Rail Kit

Fuel Fittings Kit

Fel-Pro Genuine Intake Manifold Gasket Kit

Installation Hardware

Collections: Best-Selling Products, LSX Swap Kits

Category: EFI, LS, LSX, Vortec

Type: Chevrolet

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