Sierra 18-8502 Exhaust Manifold Mounting Kit for OMC Sterndrive/Cobra I/O, Fits Manifold 18-1986-1

The Sierra 18-8502 Exhaust Manifold Mounting Kit supplies the hardware needed to install or reseal an exhaust manifold on OMC Sterndrive/Cobra I/O cooling systems. The kit is designed for use with Manifold 18-1986-1 and includes the mounting studs plus the 18-2949 manifold gasket required for a proper seal between the manifold and block, so you are not left sourcing individual studs or gaskets separately when servicing the exhaust system.

This kit is built to Sierra's standard for marine replacement parts, engineered to meet the demands of high-horsepower engines while standing up to the harsh marine environment. It is intended to meet or exceed the performance of the original equipment components it replaces. Fitment covers OMC GM Small Block V8 305-350 cu in engines (1979-89) as well as OMC/Volvo GM Small Block 305-350 cu in applications, making it a direct match for boat owners servicing these OMC-equipped sterndrives. Every Sierra part in this kit is backed by Sierra's customer satisfaction warranty, giving installers confidence that the studs and gasket will hold up over repeated heat cycling and marine exposure.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8502
• Product Type: Exhaust Manifold Mounting Kit
• Included Components: Mounting studs, 18-2949 manifold gasket
• Used With: Manifold 18-1986-1
• UPC: 808282127350
• GTIN: 00808282127350
• Weight: 0.24 pounds
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Color: White
• Material: Glass

Fitment

• OMC Sterndrive/Cobra I/O cooling systems
• OMC GM Small Block V8 305-350 cu in (1979-89)
• OMC/Volvo GM Small Block 305-350 cu in
• Use with Manifold 18-1986-1

Replaces (OEM)

• No OEM cross-reference numbers listed

Frequently Asked Questions

What does the Sierra 18-8502 mounting kit include? The kit includes the mounting studs and the 18-2949 manifold gasket needed to install or reseal an exhaust manifold, and it is designed for use with Manifold 18-1986-1.

What engines does the 18-8502 mounting kit fit? It fits OMC GM Small Block V8 305-350 cu in engines (1979-89) as well as OMC/Volvo GM Small Block 305-350 cu in applications on Sterndrive/Cobra I/O systems.

Which manifold does this mounting kit work with? Sierra 18-8502 is designed for use with Manifold 18-1986-1.

Does the 18-8502 kit include the manifold gasket? Yes, the 18-2949 manifold gasket is included as part of the Sierra 18-8502 mounting kit.

How much does the Sierra 18-8502 mounting kit weigh? The Sierra 18-8502 Exhaust Manifold Mounting Kit weighs 0.24 pounds.

What are the dimensions of the 18-8502 kit components? The listed item dimensions for the Sierra 18-8502 mounting kit are 0.39 x 0.39 x 0.39 inches.

Is this kit made for OMC Sterndrive/Cobra applications specifically? Yes, the 18-8502 mounting kit is built for OMC Sterndrive/Cobra I/O cooling system applications.

What color and material is the 18-8502 kit listed with? The Sierra 18-8502 kit is listed with a white color and glass material designation.

Are Sierra parts in the 18-8502 kit covered by a warranty? Yes, Sierra 18-8502 is covered under Sierra's customer satisfaction warranty like other Sierra parts.

Is the 18-8502 kit the same as the 18-8507 kit? No, Sierra 18-8502 is a separate mounting kit used with Manifold 18-1986-1, while 18-8507 is a different mounting kit used with an elbow, so they are not interchangeable.

Does Sierra 18-8502 include everything needed for a manifold reseal? It includes the mounting studs and the 18-2949 gasket for the manifold connection to Manifold 18-1986-1, covering the core hardware for that installation.

Is the Sierra 18-8502 mounting kit an OEM or aftermarket part? Sierra 18-8502 is a Sierra-manufactured replacement kit engineered to meet or exceed the performance of the original equipment it replaces.