Product DetailsSierra 18-1908 marine exhaust riser spacer block for MerCruiser center-rise exhaust systems from about 1985 through 2002. Replaces the 3 inch tall spacer that sits between the riser and manifold on many V6 and V8 applications. Does not come with gaskets or mounting hardware. Each purchase is for one spacer.
Riser mating bolt dimensions are 3-7/16″ (87.3mm) by 3-1/16″ (77.8mm) bolt center-to-center.
This part is new and high-quality cast iron construction. To determine if this is the correct replacement for you, look on your current part for casting numbers and match them to the cross reference below:
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Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.