Sierra Exhaust Manifold 18-1953-2 for GM V-8 305/350/377 cid MCM/MIE Marine Engines

This Sierra exhaust manifold, part number 18-1953-2, is built for GM V-8 305, 350, and 377 cid MCM/MIE marine engines (1983-2002). It routes hot exhaust gases away from the engine block and mixes them with cooling water before they exit through the riser and elbow assembly, protecting the engine from heat damage while running. The manifold is a universal fit that installs on either the port or starboard side of the engine, so one part number covers both mounting locations.

The manifold pairs with a specific set of Sierra components to complete the exhaust path. It accepts either the 18-1974-1 elbow (3 inch hose, 0 degree down angle) or the 18-1976-2 elbow (4 inch hose, 7 degree down angle), sealed with elbow gasket 18-2849-1, 18-0897, or 18-0672. For installations that need additional height, the manifold works with the 18-1908 three-inch spacer or the 18-1985 six-inch spacer, each requiring its own mounting kit. Sierra engineers this manifold to meet or exceed the performance of the original equipment part it replaces, and it is backed by a limited warranty.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1953-2
• Product Type: Exhaust Manifold
• UPC: 808282195151
• Weight: 49.1 pounds
• Engine Fitment: GM V-8 305, 350, and 377 cid MCM/MIE marine engines (1983-2002)
• Side: Port and starboard (universal fit)
• Compatible Elbow (3 inch hose): 18-1974-1, 0 degree down angle
• Compatible Elbow (4 inch hose): 18-1976-2, 7 degree down angle
• Compatible Spacer (3 inch): 18-1908
• Compatible Spacer (6 inch): 18-1985
• Compatible Elbow Gasket: 18-2849-1, 18-0897, or 18-0672

Fitment

• GM V-8 305, 350, and 377 cid MCM/MIE marine engines (1983-2002)
• Fits both port and starboard mounting positions

Frequently Asked Questions

What engines does the Sierra 18-1953-2 exhaust manifold fit? The 18-1953-2 manifold is built for GM V-8 305, 350, and 377 cid MCM/MIE marine engines (1983-2002).

Does 18-1953-2 fit both port and starboard sides? Yes, the Sierra 18-1953-2 manifold is a universal fit that installs on either the port or starboard side of the engine.

How much does this exhaust manifold weigh? The Sierra 18-1953-2 exhaust manifold weighs 49.1 pounds.

Which elbow works with the 18-1953-2 manifold? Two elbow options fit this manifold: the 18-1974-1 (3 inch hose, 0 degree down angle) and the 18-1976-2 (4 inch hose, 7 degree down angle).

What gasket do I need to seal the elbow to the 18-1953-2 manifold? Elbow gasket 18-2849-1, 18-0897, or 18-0672 is used to seal the elbow to this manifold.

Can I raise the riser height on this manifold? Yes, the 18-1953-2 manifold accepts a 3 inch spacer (18-1908) or a 6 inch spacer (18-1985) for additional riser height, each requiring its own mounting kit.

Is a mounting kit included with the manifold? The manifold itself is the exhaust manifold casting; mounting kits for the elbow and spacer combinations are separate components matched to the elbow chosen.

Is this a genuine Sierra part or aftermarket? The 18-1953-2 is a genuine Sierra part, engineered to meet or exceed the performance of the original equipment part it replaces.

What is the manufacturer part number for this manifold? The manufacturer part number is 18-1953-2.

Does this manifold come with a warranty? The Sierra 18-1953-2 exhaust manifold is backed by a limited warranty.