EGR Valve Gasket 99-13 Chevy LS

The EGR Valve Gasket 99-13 Chevy LS is an essential engine sealing component designed to prevent exhaust gas recirculation leaks on Gen III and Gen IV LS-platform engines. If you're rebuilding an LS motor, addressing valve cover seals, or performing routine maintenance on your Chevrolet, GMC, or Cadillac LS engine, this OEM-specification gasket is critical to maintaining proper EGR system function and preventing vacuum leaks that compromise combustion efficiency. The EGR valve assembly sits at the intersection of intake and exhaust systems, making its gasket one of the highest-stress sealing points in the engine bay.

Manufactured by MAHLE ORIGINAL/CLEVITE under part number G31620, this gasket is engineered to withstand sustained exposure to hot exhaust gases and variable intake manifold pressures inherent to LS engines. The precision-cut composite material resists blowout and degradation far better than aftermarket alternatives, maintaining its seal across the full rpm range from idle to redline. Its compact 12 × 24-inch footprint ensures exact fitment to the OEM flange, eliminating the micro-gaps that cause rough idle, vacuum leaks, and increased emissions. This gasket's durability directly impacts fuel trim stability and drivability on engines running stock or modified tune.

LS swap builders, street rodders, and daily drivers benefit most from this replacement gasket when performing top-end work or troubleshooting lean-running conditions tied to exhaust gas leakage. Compatible across 1999–2013 LS engines (LS1, LS2, LS3, LS6, and truck variants), it's an economical wear item to refresh during any cam, valve, or intake manifold service. Installation requires only basic hand tools and roughly 30 minutes; proper torque sequencing to the EGR valve body ensures long-term reliability and prevents repeat leaks that plague budget gasket alternatives.