Product Description
Genuine GM 12678745 Exhaust Valve for Gen V LT 5.3L Engines
Stock Replacement 1.556" Exhaust Valve for 2014-Newer L83 L84 L82 L8B 5.3L Truck & SUV Engines
Restore factory exhaust-side valvetrain function in your Gen V LT-based 5.3L engine with this Genuine GM 12678745 Exhaust Valve. Designed as a stock replacement exhaust valve for compatible L83, L84, L82, and L8B truck and SUV engines, this valve is ideal for cylinder head repair, valve replacement, engine rebuilds, valve job service, or replacing a damaged original exhaust valve. Available as a single valve or a set of 8 valves, it gives engine builders, machine shops, and repair technicians the flexibility to service one cylinder or replace the full exhaust valve set.
Key Features & Benefits
- Genuine GM Stock Replacement Exhaust Valve: This Genuine GM exhaust valve is designed for compatible Gen V LT-based 5.3L engines requiring GM part number 12678745. It provides a factory replacement option for repairing the exhaust side of the cylinder head during engine service, machine work, or a complete rebuild.
- Designed for L83, L84, L82, and L8B 5.3L Engines: This valve is built for select 2014-newer 5.3L truck and SUV engine applications using the listed Gen V LT engine codes. It is a targeted replacement part for common Chevrolet and GMC 5.3L engines found in Silverado, Sierra, Tahoe, Suburban, Yukon, and Yukon XL models.
- 1.556" Head Diameter: The valve features a 1.556" head diameter to match the supplied stock replacement specification for compatible 5.3L Gen V LT exhaust valve applications. This makes it a practical choice when replacing worn, bent, burned, or otherwise damaged exhaust valves during cylinder head service.
- 5.210" Overall Length: With a 5.210" overall length, this Genuine GM exhaust valve is designed for the correct factory-style valvetrain geometry in compatible applications. Matching valve length is important during valve jobs, head repairs, and rebuilds where installed height and valvetrain setup need to remain consistent.
- Single Valve or Set of 8 Options: Choose a single valve for a targeted repair or a set of 8 valves when servicing all exhaust valves on a complete 5.3L V8 cylinder head set. This option structure helps customers buy the correct quantity for a one-cylinder repair, machine shop valve job, or full engine refresh.
Purchase Options
- Single Valve: Ideal for replacing one damaged or worn exhaust valve.
- Set of 8 Valves: Ideal for replacing all exhaust valves on a complete V8 engine set.
Specs
- Brand: Genuine GM
- GM Part Number: 12678745
- Product Type: Exhaust valve
- Engine Family: Gen V LT-based 5.3L truck / SUV engines
- Compatible Engine Codes: L83, L84, L82, L8B
- Valve Location: Exhaust
- Head Diameter: 1.556"
- Length: 5.210"
- Available Quantity: Single valve or set of 8 valves
Key Fitments
- Fits 2014-Newer L83 L84 L82 L8B 5.3L Truck/SUV Engines
- Applications Include (5.3L Models Only):
- CHEVROLET SILVERADO 1500 2014-2024
- CHEVROLET SUBURBAN 2015-2024
- CHEVROLET TAHOE 2015-2024
- GMC SIERRA 1500 2014-2024
- GMC YUKON 2015-2024
- GMC YUKON XL 2015-2024
