Riser Spacer Kit
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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 setups—commonly for restoring/adjusting clearance so the exhaust hose routing and fitment work properly.
Common Issues: Before installing, confirm you’re 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.
Related Products & Accessories
- Browse exhaust systems & muffler-related hoses, spacers, and clamps - Use the collection filters to find matching exhaust hoses, clamps, and related maintenance parts.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.