Sierra 18-8510 Exhaust Elbow Mounting Kit for Volvo GM Small Block V8 305-350 cu.in. AQ/BB Series

The Sierra 18-8510 Exhaust Elbow Mounting Kit is built for stern drive engines using the Volvo GM Small Block V8 305-350 cu.in. Platform, covering the AQ and BB series listed below. This kit supplies the hardware needed to mount the exhaust elbow to the engine, giving you a clean, correctly torqued installation without hunting down individual fasteners and gaskets piece by piece. It is designed to be used together with the matching exhaust riser, part number 18-1909-1, so the elbow-to-riser connection seals properly on reassembly.

Because this is a mounting kit rather than a single component, it is intended for engine rebuilds, exhaust system overhauls, and routine maintenance where the elbow is being removed, resealed, or replaced. Using the correct mounting kit for your specific engine family helps prevent exhaust leaks and water intrusion at the elbow joint, both of which can lead to more serious engine damage if left unaddressed. The kit carries Sierra part number 18-8510 and is identified by UPC 808282126902 for easy reordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8510
• Product Type: Exhaust Elbow Mounting Kit
• Compatible Engine: Volvo GM Small Block V8 305-350 cu.in.
• Compatible Models: AQ and BB 200, 205, 211, 231, 225, 260, 271, 290, 311, 500, 501, 570, 571, 572
• Used With Exhaust Riser: 18-1909-1
• Weight: 34 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 808282126902

Fitment

• Volvo GM Small Block V8 305-350 cu.in. Engines
• Models: AQ and BB 200, 205, 211, 231, 225, 260, 271, 290, 311, 500, 501, 570, 571, 572
• Used with exhaust riser 18-1909-1

Frequently Asked Questions

What engines does the Sierra 18-8510 exhaust elbow mounting kit fit? It is built for the Volvo GM Small Block V8 305-350 cu.in. Engine family, covering the AQ and BB series models 200, 205, 211, 231, 225, 260, 271, 290, 311, 500, 501, 570, 571, and 572.

Does the 18-8510 kit include the exhaust elbow itself? The Sierra 18-8510 is a mounting kit, meaning it provides the hardware to install the exhaust elbow rather than the elbow itself.

What riser is the 18-8510 mounting kit designed to be used with? Sierra 18-8510 is designed to be used together with exhaust riser part number 18-1909-1.

Will 18-8510 work on a Volvo 4 cylinder B20 engine? No. The 18-8510 mounting kit is for the Volvo GM Small Block V8 305-350 cu.in. Engine models, not the 4 cylinder B20 engine, which uses a different mounting kit and riser.

Is 18-8510 a genuine Sierra part number? Yes, 18-8510 is the Sierra manufacturer part number for this Exhaust Elbow Mounting Kit.

How much does the 18-8510 exhaust elbow mounting kit weigh? The Sierra 18-8510 kit weighs 34 pounds.

What models are covered under the AQ and BB designations for this kit? The kit covers AQ and BB model numbers 200, 205, 211, 231, 225, 260, 271, 290, 311, 500, 501, 570, 571, and 572, all within the Volvo GM Small Block V8 305-350 cu.in. Platform.

Can I use 18-8510 with a different riser than 18-1909-1? The 18-8510 mounting kit is specified to be used with riser 18-1909-1 for proper fitment on the Volvo GM Small Block V8 305-350 cu.in. Engines.

What is the UPC for the Sierra 18-8510 mounting kit? The UPC for the Sierra 18-8510 Exhaust Elbow Mounting Kit is 808282126902.

Is this kit for a specific side of the engine, port or starboard? No side designation is specified for the Sierra 18-8510 Exhaust Elbow Mounting Kit; it applies to the Volvo GM Small Block V8 305-350 cu.in. Engine models listed.

When would I need to replace the exhaust elbow mounting hardware with kit 18-8510? This kit is typically needed during exhaust elbow removal, resealing, or replacement on Volvo GM Small Block V8 305-350 cu.in. Engines to ensure a proper, leak-free reinstallation.