GM L87 6.2L V8 Intake Manifold 12639087 12724936 - Silverado 1500 / Sierra 1500 2014-2026

Overview

A replacement intake manifold carrying OEM references 12639087 and 12724936 for the 6.2L Gen V V8. Supplied as a replacement intake manifold for the GM L87 6.2L EcoTec3 V8 and the closely related Gen V 6.2L applications noted below. This listing covers the component described here only; hardware such as bolts, seals and gaskets is included only where the specification list says so.

Function

The intake manifold distributes charge air evenly across the cylinders and provides the mounting pads for the throttle body and the direct-injection hardware. A sound manifold matters more on a direct-injection engine than on an older port engine, because any leak downstream of the throttle body is unmetered air that the engine control module cannot account for. Typical symptoms of a failed manifold or manifold gasket are a rough or hunting idle, lean fuel trims, a whistle under light throttle and a check-engine light.

Specifications as documented

• Component: Intake manifold
• OEM part number: 12639087; 12724936
• Engine: 6.2L Gen V V8 - L86 named in title, L87 flagged in listing match
• Model years: 2014-2026 (supplier stated)
• Package contents: 1 x intake manifold (gaskets and hardware not confirmed as included)

Compatibility

Engine: 6.2L Gen V V8 - L86 named in title, L87 flagged in listing match. Vehicle applications recorded for this part: Chevrolet Silverado 1500, GMC Sierra 1500 (6.2L applications stated by supplier). Model years: 2014-2026 (supplier stated). OEM reference: 12639087; 12724936. Fitment status recorded at the time of listing: supplier-declared oem numbers (l86 named, l87 not printed in title).

Installation

Fit new gaskets and injector seals rather than reusing old ones, keep the mating faces free of old sealant and carbon, and torque the fasteners in the published sequence. Any disturbed injector should be reseated with a new combustion seal. After assembly, check for vacuum leaks before returning the vehicle to service.

Fitment notice

Compatibility is stated for the GM L87 6.2L EcoTec3 V8 on the strength of the supplier listing and, where an OEM number is published, a parts-catalogue cross-check. GM built the 6.2L V8 in several forms, and L86, LT1, LT2 and LT4 components are not automatically interchangeable with L87 parts. Before ordering, confirm the engine RPO code and the original part number against the vehicle, and treat this listing as a guide rather than a substitute for that check. Specialist engine repairs should be carried out by a qualified technician.