Sierra 18-2949-9 Exhaust Manifold Gasket, Pack of 2, Replaces 96306, Fits MCM/MIE GM V-8 283/305/350/377 cid Engines

The Sierra 18-2949-9 Exhaust Manifold Gasket is a direct-fit replacement gasket sold as a pack of 2, designed for MCM/MIE GM V-8 engines in 283, 305, 350, and 377 cubic-inch displacement. It is built for use with the 18-1951-1 exhaust manifold, sealing the manifold-to-block joint to prevent exhaust and coolant leaks that can lead to overheating, corrosion, or engine damage if left unaddressed. Each gasket is manufactured to match OEM dimensions and sealing performance, giving a reliable fit without modification during manifold service or replacement.

Because exhaust manifold gaskets are wear items exposed to constant heat cycling and saltwater or freshwater cooling passages, replacing them with a properly sized gasket like the 18-2949-9 helps maintain a tight seal and supports long-term reliability of the exhaust system. The pack-of-2 quantity is convenient for servicing both sides of a V-8 manifold setup in a single order.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2949-9
• Product Type: Exhaust Manifold Gasket
• Pack Quantity: 2
• Weight: 0.42 pounds
• Engine Fitment: MCM/MIE GM V-8 283, 305, 350 and 377 cid engines
• Manifold Fitment: 18-1951-1
• OEM Cross-Reference: 96306

Fitment

• MCM/MIE GM V-8 (283, 305, 350 and 377 cid) engines
• Use with exhaust manifold 18-1951-1

Replaces (OEM)

• 96306

Frequently Asked Questions

What engines does the Sierra 18-2949-9 exhaust manifold gasket fit? The 18-2949-9 fits MCM/MIE GM V-8 engines in 283, 305, 350, and 377 cubic-inch displacement.

How many gaskets come in this package? The 18-2949-9 is sold as a pack of 2 exhaust manifold gaskets.

Which exhaust manifold does this gasket work with? This gasket is designed for use with the 18-1951-1 exhaust manifold.

What OEM part number does the 18-2949-9 replace? It replaces OEM part number 96306.

How much does the 18-2949-9 gasket set weigh? The package weighs 0.42 pounds.

Is the 18-2949-9 a direct OEM replacement? Yes, the Sierra 18-2949-9 is manufactured to match the original 96306 gasket for a direct-fit replacement.

Do I need one pack or two for a V-8 manifold job? One 18-2949-9 pack contains 2 gaskets, which covers a typical two-gasket manifold installation.

What happens if I do not replace a worn exhaust manifold gasket? A worn gasket at the manifold-to-block joint on a 283, 305, 350, or 377 cid GM V-8 can leak exhaust or coolant, so installing the 18-2949-9 during manifold service helps maintain a proper seal.

Can this gasket be reused after removal? No, exhaust manifold gaskets like the 18-2949-9 are designed for one-time use and should be replaced with a new set anytime the manifold is removed.

Is the 18-2949-9 suitable for both MCM and MIE engine configurations? Yes, it is designed to fit both MCM and MIE GM V-8 283, 305, 350, and 377 cid engines.