ACDelco 12612350 GM Original Equipment Oil Pan Gasket - OEM Fit

In this review the author examines the ACDelco 12612350 GM Original Equipment oil pan gasket and why it matters for owners of LS-series engines. The bottom line: this gasket is a straightforward OEM replacement that fits most LS engines (except LS7 and LS9) and is chosen for its reliable fit and sealability. It is best suited to technicians and DIYers who need a direct factory-style swap for models like Tahoe, Yukon, Silverado, Escalade and a wide range of GM cars and trucks.

Key Features

• Direct OEM fit: Designed to match GM factory dimensions so it installs without modification on compatible LS-series engines.
• Wide vehicle coverage: Compatible with many models from Avalanche and Escalade to Camaro and Corvette, reducing the need to source multiple gasket types.
• Engine compatibility: Fits most LS engines including 4.8, 5.3, 6.0 and 6.2L variants, making it useful across swaps and rebuilds.
• One per engine: Supplied as a single gasket per engine, which clarifies ordering and ensures you replace the pan gasket fully.
• OEM material spec: Built to GM original equipment standards for sealability and long-term durability when installed correctly.

Who It's For

This gasket is for owners and mechanics working on GM vehicles with LS-series engines who want a factory-style replacement part. It is especially appropriate for those servicing Tahoe, Yukon, Escalade variants, Silverado/Sierra hybrids, Camaro, Corvette and various full-size GM sedans and trucks where maintaining OEM fit and function matters.

It is not for owners of LS7 or LS9 engines, which are explicitly excluded, nor for someone seeking a universal aftermarket gasket with modified fit features; those users should look for gaskets designed for their specific non-LS applications or modified engine setups.

Pros & Cons

Pros

• OEM-level fit reduces installation time and ensures correct alignment with oil pan bolt patterns.
• Good sealability for many users, reducing the likelihood of oil seepage when installed properly.
• Broad model coverage makes it convenient for shops that work on diverse GM lineups.

Cons

• Some customers report occasional leakage, so careful surface preparation and correct torqueing are important.

Specifications

Brand	GM GENUINE PARTS
Part type	Oil pan gasket (upper)
Engine fitment	All LS-series engines except LS7 and LS9
Quantity required	1 per engine
Compatible engines	4.8L, 5.3L, 6.0L, 6.2L variants
Vehicle coverage	Avalanche, Escalade, Tahoe, Yukon, Suburban, Silverado, Sierra and more

Our Verdict

The ACDelco 12612350 gasket is a sensible buy for anyone replacing an oil pan gasket on a compatible LS-series engine who wants OEM compatibility and straightforward installation. While a few users mention leak issues, most report quality fit and good value when the pan surfaces are cleaned and fasteners torqued to spec, making it a practical, cost-effective replacement for GM repairs.

Frequently Asked Questions

Will this gasket fit my LS2 6.0 TBSS?
Yes, the gasket fits TBSS 6.0 LS2 engines as part of the LS-series compatibility, assuming no aftermarket pan modifications.

How many gaskets do I need per engine?
The part is sold as one gasket and the manufacturer specifies one per engine for a full replacement.

Are there known leak problems?
Most users report good sealability, but some have experienced leaks; proper surface prep and correct torque are essential to avoid seepage.