Riser Spacer Kit

The Riser Spacer Kit helps add center-rise height to marine exhaust riser systems to improve exhaust hose clearance and help prevent back-flow concerns.

Key Features

• Adds 3″ of center rise to the exhaust riser area (as described by product listings for this kit).
• Complete riser spacer kit package (includes mounting hardware per published kit descriptions).
• Designed for marine power small-block and related applications using compatible riser systems (verify your exact riser/exhaust configuration before installation).

Product Compatibility

• Marine exhaust riser spacer applications (center-rise exhaust systems).
• Marine Power small block V8 applications such as 305, 350, 4.3L, 454, 5.0L, 7.4L, 8.2L (application guidance shown by published listings).

Product Details

• Kit SKU: 47-1908K (handle: riser-spacer-kit-47-1908k).
• Mfr. part number shown in listings: 18-1908K (Sierra riser spacer kit).
• Riser spacer height: 3″ center rise (as described by published listings for this kit).
• Includes mounting hardware (as described by published kit listings for this kit).
• Weight (from Shopify variant data): 7484 grams.

Parts Desk Insights

Best Use Case: Use this kit when you need additional riser height for center-rise exhaust setupscommonly for restoring/adjusting clearance so the exhaust hose routing and fitment work properly.

Common Issues: Before installing, confirm youre matching the correct riser spacer height and the correct riser/exhaust manifold configuration. If your hose routing is still tight after spacer installation, re-check alignment, gasket/seal surfaces, and that mating parts are seated squarely.

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