18-1949 Manifold Spacer

Prevent backflow and clearance issues with a spacer.

In combatting exhaust back-flow or clearance issues, a spacer can make a big difference. Sierra spacers provide extra height to exhaust risers and help prevent water from traveling back into the riser when throttling down. Installation of a spacer can also provide added clearance for exhaust hose routing. Engineered to be compatible with manifolds used on many Ford and GM based V8 marine engines these spacers feature CNC machined mating surfaces to eliminate additional preparation to establish a proper seal. Sierra uses special casting techniques to create risers with uniform wall thickness and leak tests each spacer prior to paint to ensure quality. For a solution to complex exhaust issues, look to Sierra spacers.

Key Features

• Engineered to meet or exceed OEM specifications
• Adds height to exhaust elbow to prevent back-flow issues or add exhaust hose clearance
• Compatible with Small Block Ford based V8 (302 and 351 cu.in.) and Small Block (305 and 350 cu. in.) and Big Block GM based V8 (454 cu. in.) marine engines
• Backed by SeaStar Solutions Limited Two-Year Warranty

18-1949 Application Guide

The Sierra Engine Parts Selector

In addition to riser extensions, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see our Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.