18-1985 Manifold Spacer for Mercruiser Stern Drives
Increase riser height for clearance or put exhaust outlets further above the waterline
6" can make a big difference in combatting back-flow issues on engines installed close to the waterline or transom. These Sierra spacers provide the extra height to prevent water from traveling back into the riser when throttling down and they can also provide added clearance for exhaust hose routing. Engineered to be compatible with GM based V6 and V8 marine engines, these riser extensions feature machined mating surfaces that eliminate additional preparation to establish a proper seal. Each riser is leak tested prior to paint to ensure quality.
Key Features
- Engineered to meet or exceed OEM specifications
- Adds 6" of height to exhaust riser to prevent back-flow issues or add exhaust hose clearance
- Fits: GM based V6 229 and 262, Small Block V8 305-350, Big Block V8 454
- Backed by SeaStar Solutions Limited Two-Year Warranty
The Sierra Engine Parts Selector
In addition to carb kits, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourĀ Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.
Application | OEM Part Number |
---|---|
Barr | MC 20 93322A3 |
GLM | 50610 |
Mallory | 9-40531 |
Marine Power | 612011 |
MerCruiser Sterndrive | 93322 |
Osco | 3322 |