Product DetailsSierra 18-1951-1 starboard side marine exhaust manifold. This manifold will replace most 1977 to 1982 MerCruiser (GM) 5.0L and 5.7L V8’s (end rise) including models 198, 228, 250, 260, and 898. Comes with gasket kit and riser studs (see picture). Fits Starboard side only. Find the port side here. Each purchase is for one manifold.
Riser mating bolt dimensions are 3-1/16″ (77.8mm) by 2-13/16″ (71.4mm) 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.