Sierra 18-1950-1 port 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 Port side only. Find the starboard 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:

Cross Reference	Part Number
MerCruiser	77234, 77234A2
Osco Motors	7234B
Barr Marine	MC-1-77234
Sierra Marine	18-1950-1
Aqua Power	5508
GLM Products	51237

About Sierra
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.

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