Genuine GM Gen V LT Exhaust Manifold Header Gasket | GM 12657093 | Fits 2014+ Gen V LT Engines LT1 LT4 L82 L83 L84 L86 L87 L8T | OEM Multi-Layer Steel Gaskets

The GM 12657093 Exhaust Manifold/Header Gasket Pair is built to handle the extreme heat and pressure of today’s Gen V LT engines. Manufactured by GM with a multi-layer steel (MLS) design, these gaskets deliver unmatched sealing integrity—whether you’re bolting up stock manifolds or installing aftermarket headers. Engineered for LT1, LT4, L82, L83, L84, L86, L87, and L8T engines, this pair of gaskets ensures long-lasting performance, prevents exhaust leaks, and resists blowouts under demanding conditions. Perfect for daily drivers, performance street builds, and boosted applications, these OEM gaskets are trusted by professional builders and racers to keep Gen V engines sealed and performing at their best.

• OEM GM Quality – Genuine GM part 12657093, manufactured to factory specifications for a guaranteed fit and long service life on Gen V LT platforms.
• Leak-Free Multi-Layer Steel Construction – MLS gasket technology provides superior sealing against extreme exhaust heat, pressure, and vibration—far more durable than paper or composite gaskets.
• Perfect for Stock or Performance Headers – Works with OEM exhaust manifolds or aftermarket performance headers, giving you flexibility for any build or upgrade.
• Resists Blowouts & Warping – Designed to maintain seal integrity under high-RPM, boosted, or high-compression conditions where inferior gaskets fail.
• Wide Gen V LT Coverage – Fits LT1, LT4, L82, L83, L84, L86, L87, and L8T engines found in GM performance cars and trucks from 2014 to present.