Sierra 18-8504 Exhaust Elbow Mounting Kit for 18-1899 Riser, PleasureCraft Ford Small Block V8 302/351 CID

The Sierra 18-8504 Exhaust Elbow Mounting Kit is the hardware set used to mount Sierra's 18-1899 exhaust riser (with 3 inch outlet) to the engine. It is built for PleasureCraft Ford Small Block V8 engines in the 302 and 351 CID range. The kit includes one Sierra 18-0677-1 exhaust elbow gasket along with the mounting hardware needed to complete the installation, so you are not left sourcing separate fasteners or gaskets to finish the job.

This kit is a companion part to the 18-1899 riser rather than a standalone riser or manifold, so it should be paired with that riser (or an existing riser of the same type) during installation. Sierra manufactures its exhaust components to meet or exceed the specifications of the original equipment parts they replace, giving boat owners a reliable way to reseal and remount their exhaust elbow without waiting on OEM lead times.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8504
• Product Type: Exhaust Elbow Mounting Kit
• Includes: 18-0677-1 Exhaust Elbow Gasket and mounting hardware
• Used With: 18-1899 Riser (3 inch outlet)
• Engine Fitment: PleasureCraft Ford Small Block V8 (302 and 351 CID) engines
• Interchangeable With: Mallory 9-40871, Osco 29001-MK
• Finish: Machined
• Weight: 0.24 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 808282127022

Fitment

• PleasureCraft Ford Small Block V8 (302 and 351 CID) engines

Replaces (OEM)

• Mallory 9-40871
• Osco 29001-MK

Frequently Asked Questions

What is included in the Sierra 18-8504 kit? The 18-8504 kit includes one Sierra 18-0677-1 exhaust elbow gasket plus the mounting hardware needed to install the exhaust elbow, so no separate gasket or fastener purchase is required.

What engines does the 18-8504 mounting kit fit? This kit is designed for PleasureCraft Ford Small Block V8 engines in the 302 and 351 CID displacement range.

Which riser does the 18-8504 mounting kit go with? The 18-8504 kit is used with Sierra's 18-1899 riser, which has a 3 inch outlet.

Is the Sierra 18-8504 interchangeable with other brands? Yes, the 18-8504 mounting kit is interchangeable with Mallory 9-40871 and Osco 29001-MK.

What does the 18-8504 kit weigh? The Sierra 18-8504 Exhaust Elbow Mounting Kit weighs 0.24 pounds.

What are the dimensions of the 18-8504 kit? The kit measures 0.39 x 0.39 x 0.39 inches.

What finish does the 18-8504 hardware have? The mounting hardware in the 18-8504 kit has a machined finish.

Does the 18-8504 kit include a manifold? No, the 18-8504 is a mounting kit for the 18-1899 riser; it does not include an exhaust manifold.

Is the Sierra 18-8504 gasket the same as a genuine OEM gasket? Sierra manufactures the 18-0677-1 gasket included in the 18-8504 kit to meet or exceed the specifications of the original equipment part it replaces.

Can the 18-8504 kit be used to reseal an existing riser installation? Yes, since it supplies the elbow gasket and mounting hardware for the 18-1899 riser, the 18-8504 kit can be used when remounting or resealing that riser on PleasureCraft Ford Small Block V8 302/351 CID engines.

What is the UPC for the Sierra 18-8504 kit? The Sierra 18-8504 Exhaust Elbow Mounting Kit has UPC 808282127022.