Apex AMS3711

Apex AMS3711 is an exhaust manifold gasket set for selected GM LS-family V8 engines. The gaskets seal the exhaust manifolds to the cylinder heads and are intended to service both cylinder banks during manifold removal and installation.

Application / fitment

The set is catalogued for a broad range of GM Gen III and Gen IV engines in 4.8, 5.3, 5.7, 6.0 and 6.2 L displacements. Vehicle listings span approximately 1997–2020. Confirm fitment by engine code and catalogue number because the same vehicle models were supplied with different engine families.

• selected Chevrolet Corvette C5/C6, Camaro, Caprice and SS plus Pontiac Firebird, GTO and G8
• Chevrolet Silverado, Suburban, Tahoe, Avalanche and Express
• GMC Sierra, Yukon, Savana and Envoy
• Cadillac CTS, Escalade, Escalade ESV and Escalade EXT
• Hummer H2, H3 and H3T
• selected Buick, Isuzu and Saab 9-7X applications using GM V8 engines

AMS3711 must not be confused with AMS3227. AMS3711 primarily serves the later LS family, while AMS3227 covers earlier Chevrolet Small Block and Vortec 5.0/5.7 L engines. Compare port shape, bolt pattern and engine code before installation.

Technical information

• part type: exhaust manifold gasket set
• location: exhaust manifold to cylinder head
• engine family: selected GM Gen III/Gen IV V8
• catalogued displacements: 4.8 / 5.3 / 5.7 / 6.0 / 6.2 L
• catalogued vehicle range: approximately 1997–2020
• repair coverage: both cylinder banks
• manifold bolts: not included unless stated on the physical package
• sales unit: 1 engine set

Cylinder-head and manifold surfaces must be clean and flat. Inspect the manifolds for cracks or warpage and tighten fasteners in the specified sequence and to the engine manufacturer's torque specification.