Product Description
Genuine GM 12686561 LS3 Intake Manifold
OEM LS3 Car Intake | Rectangle Port Upgrade | High Flow Performance Design
The Genuine GM LS3 Intake Manifold (12686561) is a proven high-performance upgrade for rectangle port LS engines, delivering improved airflow, throttle response, and horsepower potential. Designed for LS3-equipped vehicles, this intake is widely used in performance swaps, hot rods, and conversions where maximizing airflow and maintaining OEM reliability are critical. Whether you're upgrading a factory setup or converting a truck-based engine to a car-style intake system, this manifold provides the ideal balance of performance and fitment.
Key Features & Benefits
- Genuine GM OEM Quality – Manufactured to GM’s strict OE specifications for fit, form, and function, ensuring long-term durability and consistent performance.
- Improved Airflow Design – Optimized runner design and plenum volume increase airflow efficiency, supporting higher horsepower and better throttle response.
- Popular Swap Upgrade – Ideal for converting rectangle port truck engines to a car-style intake setup, making it a go-to solution for LS swaps and custom builds.
- Complete with Seals – Includes runner seals and front opening seals for proper installation and leak-free performance.
- Proven Performance Platform – Widely used in performance builds, hot rods, and street applications for its ability to support both stock and modified engines.
What’s Included
- LS3 Intake Manifold
- Runner Seals
- Front Opening Seals
Fitment
- Fits LS3 and Rectangle Port LS Engines
- Common Applications: L76, L92, LY6, L96, L99, LS3
- Ideal For: LS swaps, car conversions, and hot rod builds using rectangle port cylinder heads
Important Notes
- Designed for rectangle port cylinder heads only—will not fit cathedral port applications.
- Throttle body, fuel rails, and injectors are not included and must be sourced separately depending on your application.
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Product Reviews
3 Reviews Hide Reviews Show Reviews
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Intake manifold
Was shipped and delivered faster than expected
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LS3 intake
Correct product and fast shipping. Will continue to order from you guys
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Genuine GM intake
Looks SOOO much better than the truck intake. Good price and was in stock. Fast shipping.
