GM L87 6.2L V8 Piston 12656874 with Pin and Ring Set 12685185 - Right Hand, Gen V

Overview

A 103 mm piston referenced to OEM 12656874, supplied with a pin and offered alongside the matching ring kit number for the 6.2L Gen V V8. Supplied as a replacement piston with pin and ring set (right hand) 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

A piston carries combustion pressure to the connecting rod, manages heat and controls the ring seal against the bore. In a direct-injection engine it also has to cope with a stratified charge and, in some calibrations, with the higher thermal load that comes with it. Wear or damage shows up as oil consumption, blow-by, a ticking or slapping noise when cold, or a compression reading that falls away on one cylinder.

Specifications as documented

• Component: Piston with pin and ring set (right hand)
• OEM part number: 12656874 (right hand); 12656875 (left hand, second number in title); ring set 12685185
• Cross-reference: 12691848 recorded as a supersession of 12656874 by a GM parts retailer listing
• Engine: 6.2L Gen V V8 - L86 / L87 flagged in listing match
• Model years: Not stated in captured listing data; GM catalogue page lists current 6.2L applications
• Dimensions: 103 mm piston diameter as stated in supplier title
• Package contents: 1 x piston with pin; ring set inclusion per piece not confirmed

Compatibility

Engine: 6.2L Gen V V8 - L86 / L87 flagged in listing match. Vehicle applications recorded for this part: Chevrolet Silverado 1500, GMC Sierra 1500 Limited, Chevrolet Tahoe - 6.2L applications. Model years: Not stated in captured listing data; GM catalogue page lists current 6.2L applications. OEM reference: 12656874 (right hand); 12656875 (left hand, second number in title); ring set 12685185. Fitment status recorded at the time of listing: oem number cross-checked to 6.2l application; l87 rpo not printed by either source.

Installation

Pistons are matched to a bore size and a direction. Confirm standard versus oversize before ordering, keep the assembly marks facing the correct way, fit new rings with the correct end gaps and clock the ring gaps as specified, and use new rod bolts where the originals are torque-to-yield. Bore condition should be measured, not judged by eye.

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.