The Texas Speed L86 Intake Manifold Swap Kit upgrades a GM 5.3L L83 engine to the larger factory intake manifold and throttle body used on the 6.2L L86. The swap is a common L83 upgrade because it improves airflow and adds horsepower while keeping a stock GM appearance and fitment under the hood. Texas Speed estimates a gain of 8 to 10 horsepower depending on tuning and other modifications.
The kit assembles the genuine GM L86 intake manifold, intake manifold gasket seals, throttle body gasket and PCV tube with your choice of the standard GM L86 throttle body or a Katech CNC ported 87mm throttle body for additional airflow. ECU tuning is required after installation, and because the L86 throttle body is larger than the L83 unit, a different intake tube coupler may be needed and is not included.
Specifications
- Application: GM 5.3L L83 engines (2014 to 2018 Silverado 1500 and Sierra 1500, 2015 to 2020 Tahoe, Suburban and Yukon per Texas Speed)
- Intake manifold: Genuine GM L86 6.2L intake manifold (GM 12639087)
- Throttle body options: GM L86 throttle body (GM 12740727) or Katech CNC ported 87mm throttle body (KAT-A6856), selected at ordering
- Gaskets: Intake manifold gasket seals, 8 (GM 12626354), and L86 throttle body gasket (GM 12639086)
- PCV tube: GM PCV tube (GM 12650610)
- Estimated gain per Texas Speed: 8 to 10 horsepower, depending on tuning and modifications
- Tuning: ECU tuning required
- Does not fit 2022 and newer vehicles with five-terminal throttle bodies
Kit Includes
- Genuine GM L86 6.2L intake manifold, bare (GM 12639087)
- GM intake manifold gasket seals, qty 8 (GM 12626354)
- GM L86 throttle body gasket (GM 12639086)
- GM PCV tube (GM 12650610)
- Throttle body: GM L86 (GM 12740727) or Katech CNC ported 87mm (KAT-A6856), selected at ordering
Ordering Options
Select the Throttle Body option when ordering: the standard GM L86 throttle body (GM 12740727) or the Katech CNC ported 87mm throttle body (KAT-A6856). The Katech throttle body replaces the GM L86 throttle body in the kit rather than adding to it.
Note: ECU tuning is required when installing the L86 intake manifold and throttle body on an L83 engine.
Note: The L86 throttle body is larger than the factory L83 throttle body. Depending on the cold air intake in use, a larger or different coupler may be required to connect the intake tube, and it is not included in this kit.
Note: Does not fit 2022 and newer vehicles with five-terminal throttle bodies. Confirm the throttle body connector terminal count before ordering.
Vehicle Applications
GMC Sierra 1500
- 2014 GMC Sierra 1500 — 5.3L L83
- 2015 GMC Sierra 1500 — 5.3L L83
- 2016 GMC Sierra 1500 — 5.3L L83
- 2017 GMC Sierra 1500 — 5.3L L83
- 2018 GMC Sierra 1500 — 5.3L L83
Chevrolet Silverado 1500
- 2014 Chevrolet Silverado 1500 — 5.3L L83
- 2015 Chevrolet Silverado 1500 — 5.3L L83
- 2016 Chevrolet Silverado 1500 — 5.3L L83
- 2017 Chevrolet Silverado 1500 — 5.3L L83
- 2018 Chevrolet Silverado 1500 — 5.3L L83
Chevrolet Suburban
- 2015 Chevrolet Suburban — 5.3L L83
- 2016 Chevrolet Suburban — 5.3L L83
- 2017 Chevrolet Suburban — 5.3L L83
- 2018 Chevrolet Suburban — 5.3L L83
- 2019 Chevrolet Suburban — 5.3L L83
- 2020 Chevrolet Suburban — 5.3L L83
Chevrolet Tahoe
- 2015 Chevrolet Tahoe — 5.3L L83
- 2016 Chevrolet Tahoe — 5.3L L83
- 2017 Chevrolet Tahoe — 5.3L L83
- 2018 Chevrolet Tahoe — 5.3L L83
- 2019 Chevrolet Tahoe — 5.3L L83
- 2020 Chevrolet Tahoe — 5.3L L83
GMC Yukon
- 2015 GMC Yukon — 5.3L L83
- 2016 GMC Yukon — 5.3L L83
- 2017 GMC Yukon — 5.3L L83
- 2018 GMC Yukon — 5.3L L83
- 2019 GMC Yukon — 5.3L L83
- 2020 GMC Yukon — 5.3L L83
Vehicle applications reflect the fitment published by Texas Speed & Performance for this part number. Confirm your engine and cylinder head configuration before ordering.
FAQ
What engines does the Texas Speed L86 intake manifold swap kit fit?
It fits GM 5.3L L83 engines, with Texas Speed listing the 2014 to 2018 Silverado 1500 and Sierra 1500 and the 2015 to 2020 Tahoe, Suburban and Yukon. It does not fit 2022 and newer vehicles that use a five-terminal throttle body.
What is included in the L86 intake swap kit?
The kit includes a genuine GM L86 6.2L intake manifold, eight intake manifold gasket seals, an L86 throttle body gasket, a GM PCV tube and your choice of the GM L86 throttle body or a Katech CNC ported 87mm throttle body.
How much horsepower does the L86 intake add to an L83?
Texas Speed estimates a gain of 8 to 10 horsepower from the larger L86 intake manifold and throttle body on a 5.3L L83, with results depending on tuning, engine configuration and supporting modifications.
Is tuning required after installing the L86 intake on an L83?
Yes. Texas Speed states that ECU tuning is required when the L86 intake manifold and throttle body are installed on an L83 engine.
Will my cold air intake connect to the L86 throttle body?
Not necessarily. The L86 throttle body is larger than the L83 throttle body, so depending on the intake in use a larger or different coupler may be needed to connect the intake tube. That coupler is not included in the kit.
Should I choose the GM L86 throttle body or the Katech ported throttle body?
The GM L86 throttle body is the standard factory 6.2L unit and completes the swap as GM built it. The Katech CNC ported 87mm throttle body replaces it in the kit and is ported for additional airflow for builders who want to go a step further.
