Product Description
Genuine GM L86 L87 L8T Intake Manifold 12639087 | Performance Upgrade for Gen V LT Engines
Fits 2014+ GM 6.2L L86 L87 L8T & Upgrades 5.3L L83 L84 L82 L8B Gen V LT Truck & SUV Engines
Upgrade your Gen V LT truck or SUV engine with this Genuine GM L86/L87/L8T intake manifold (Like GM #12639087), engineered for improved airflow, increased horsepower potential, and OEM-level reliability. Designed from the factory for 6.2L applications, this intake manifold has become a proven performance upgrade for 5.3L engines, delivering noticeable gains in mid-range and top-end power without sacrificing drivability. Unlike many aftermarket options, this intake retains compatibility with the factory accessory drive, making it an ideal solution for clean, efficient swaps. Whether you're building a street truck, performance daily driver, or full LT swap project, this GM intake manifold provides the perfect balance of performance, fitment, and long-term durability. For proper installation on 5.3L setups, an 87mm throttle body, PCV hose, throttle body gasket, and intake seals are required, along with PCM tuning to maximize performance gains.
Key Features & Benefits
- Genuine GM OEM Quality: Manufactured by GM for L86, L87, and L8T engines, this intake manifold delivers factory-level fitment, durability, and reliability, ensuring long service life and consistent performance compared to aftermarket alternatives.
- Proven 5.3L Performance Upgrade: Widely used upgrade for L83, L84, L82, and L8B engines, this manifold improves airflow characteristics to unlock additional horsepower and torque, especially in the mid to upper RPM range.
- Factory Accessory Drive Compatibility: Unlike many aftermarket intake manifolds, this GM design retains full compatibility with the factory accessory drive system, simplifying installation and reducing the need for additional modifications.
- Optimized Airflow Design: Engineered with larger runners and improved plenum volume, this intake manifold enhances engine breathing efficiency, supporting increased power output while maintaining smooth drivability.
- Ideal for Performance Builds & Swaps: Perfect for street performance builds, engine swaps, or upgraded daily drivers, this intake provides a clean OEM-style solution that balances performance gains with ease of installation and long-term reliability.
Key Fitments
- 6.2L Direct Fit Applications: 2014+ GM trucks and SUVs equipped with L86, L87, and L8T Gen V LT engines.
- 5.3L Performance Upgrade: 2014+ GM Gen V LT 5.3L engines including L83, L84, L82, and L8B requiring 87mm throttle body, PCV hose, gasket, and seals.
- Gen V LT Swap Applications: Ideal for custom builds and swaps utilizing GM LT-based engines where improved airflow and OEM reliability are desired.
