Sierra Exhaust Manifold Mounting Kit 18-8520 for Mercruiser 18-1950-1, 18-1951-1 Manifolds

The Sierra 18-8520 is a complete exhaust manifold mounting kit engineered to install and reseal Mercruiser exhaust manifolds 18-1950-1 and 18-1951-1. Rather than sourcing a gasket and fasteners separately, this kit bundles the parts needed to remount the manifold in one purchase, saving a trip back to the parts counter mid-job.

Inside the kit is the 18-2949 manifold gasket, which seals the manifold-to-block mating surface, along with the mounting bolts required for installation. The kit also includes the 18-8548 hardware kit, which supplies the hardware specific to the 18-1950-1 and 18-1951-1 manifolds, so the fastener sizing and count match the application rather than requiring guesswork from a generic hardware assortment.

This kit is intended for the manifold mounting/reseal job only; it is not a full manifold, riser, or elbow replacement. Confirm your manifold part number is 18-1950-1 or 18-1951-1 before ordering, since Sierra also offers separate mounting kits for other manifold and front/end plate combinations.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8520
• Product Type: Exhaust Manifold Mounting Kit
• Category: Mercruiser Exhaust Manifolds
• Use With Manifolds: 18-1950-1, 18-1951-1
• Kit Includes: 18-2949 manifold gasket, mounting bolts, 18-8548 hardware kit
• UPC: 808282127169
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.8 pounds

Fitment

• Mercruiser exhaust manifold 18-1950-1
• Mercruiser exhaust manifold 18-1951-1

Frequently Asked Questions

What manifolds does the Sierra 18-8520 mounting kit fit? The 18-8520 is designed for use with Mercruiser exhaust manifolds 18-1950-1 and 18-1951-1.

What is included in the 18-8520 mounting kit? The kit includes the 18-2949 manifold gasket, mounting bolts, and the 18-8548 hardware kit, which supplies the hardware for the 18-1950-1 and 18-1951-1 manifolds.

Does the 18-8520 kit include a manifold gasket? Yes, the 18-2949 manifold gasket is included as part of the 18-8520 mounting kit.

Is the 18-8548 hardware kit sold separately from the 18-8520? No separate purchase is needed for this application; the 18-8548 hardware kit is already included in the 18-8520 mounting kit.

Does the 18-8520 kit come with a manifold? No, the 18-8520 is a mounting kit only, supplying the gasket and hardware needed to mount the 18-1950-1 or 18-1951-1 manifold; it does not include the manifold itself.

How much does the Sierra 18-8520 mounting kit weigh? The Sierra 18-8520 exhaust manifold mounting kit weighs 0.8 pounds.

Can the 18-8520 kit be used with other Sierra manifold mounting configurations? The 18-8520 is specified for the 18-1950-1 and 18-1951-1 manifolds; other manifold, front plate, or elbow combinations use different Sierra mounting kits such as 18-8512, 18-8514, or 18-8554.

Is this a genuine Sierra part? Yes, the 18-8520 is a Sierra branded exhaust manifold mounting kit, part number 18-8520.

What is the product dimension listed for the 18-8520 kit? The 18-8520 mounting kit is listed at 0.39 x 0.39 x 0.39 inches.

Do I need additional mounting bolts to install this kit? No, mounting bolts are included in the 18-8520 kit along with the 18-2949 gasket and 18-8548 hardware kit.