Product Description
Genuine GM 12629513 & 12678746 Valve Set – Intake & Exhaust Valves
Fits 2014+ L86, L87 & LT1 6.2L Engines | Includes 8 Intake & 8 Exhaust Valves
The Genuine GM 12629513 and 12678746 Valve Set includes OEM-quality intake and exhaust valves designed specifically for Gen V LT-based 6.2L engines such as the L86, L87, and LT1. This complete 16-valve set provides the same materials, geometry, and manufacturing quality as factory-installed components. Each intake valve features a lightweight hollow stem for reduced mass and improved high-RPM stability, while each exhaust valve is sodium-filled for superior heat dissipation and long-term reliability. Ideal for stock rebuilds, performance refreshes, or restoring OEM flow and durability.
Key Features
- Genuine GM valve set includes 8 intake valves (PN 12629513) and 8 exhaust valves (PN 12678746)
- OEM replacement for Gen V LT-series 6.2L engines including L86, L87, and LT1
- 2.126" hollow stem intake valves reduce valvetrain mass and improve RPM response
- 1.59" sodium-filled exhaust valves improve heat transfer and durability under load
- Manufactured to GM OE specifications for precise fitment, sealing, and longevity
- Perfect for stock engine rebuilds, refreshes, or high-performance applications retaining OEM reliability
Valve Specifications
- Intake Valve Head Diameter: 2.126"
- Exhaust Valve Head Diameter: 1.59"
- Intake Valve Type: Hollow Stem (Lightweight Design)
- Exhaust Valve Type: Sodium-Filled (Improved Heat Dissipation)
- Quantity: 16 total valves (8 intake + 8 exhaust)
Key Fitments
- CADILLAC ESCALADE: 2015–2024
- CHEVROLET: Camaro 2016–2024, Corvette 2014–2019, Silverado 1500 2014–2024, Suburban 2019–2024, Tahoe 2018–2024
- GMC: Sierra 1500 2014–2025, Yukon 2015–2024, Yukon XL 2015–2024
Note: Fits 6.2L Gen V LT-based engines only (L86, L87, LT1). Not compatible with 5.3L L83 or L84 engines. For best results, always verify head casting and valve part numbers before installation.
