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 SierraSierra 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.
Please read the information above thoroughly before asking a question. Questions are generally answered Monday through Friday, 8am to 4pm PST. All correspondence must be via Email or eBay Message.