GM L87 6.2L V8 Valve Lifter Oil Manifold 12697806 - Gen V 6.2L

Overview

A valve lifter oil manifold offered against OEM references 12697806, 12619821, 28289742 and 12631625 for Gen V V8 lifter oil circuits. Supplied as a replacement valve lifter oil 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

In a pushrod V8 the lifter oil manifold distributes pressurised oil to the hydraulic roller lifters, and on engines with displacement-on-demand it also provides the gallery that lets the control system switch lifter oil circuits. Restricted or leaking oil feed here produces lifter tick that is loudest on a cold start, a misfire on the affected cylinders, and, where the system is displacement-on-demand, a stored fault for the lifter oil control circuit.

Specifications as documented

• Component: Valve lifter oil manifold
• OEM part number: 12697806; 12619821; 28289742; 12631625
• Cross-reference: Four OEM numbers listed together by the supplier
• Engine: 6.2L Gen V V8 - L86 / L87 flagged in listing match
• Model years: Not stated in captured listing data
• Package contents: 1 x oil manifold per piece (seals not confirmed as included)

Compatibility

Engine: 6.2L Gen V V8 - L86 / L87 flagged in listing match. Vehicle applications recorded for this part: Cadillac applications as stated by supplier (title truncated). Model years: Not stated in captured listing data. OEM reference: 12697806; 12619821; 28289742; 12631625. Fitment status recorded at the time of listing: supplier-declared oem numbers (l87 flagged in listing match).

Installation

The gallery and its sealing faces must be clean before assembly, and any associated filter or screen should be replaced rather than cleaned. Use new seals, torque the manifold evenly, and confirm oil pressure at start-up before the engine is run under load. Debris left in the gallery will migrate straight to the lifters.

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.