A solution to corroded or damaged risers. Constant heat cycling and exposure to seawater and freshwater cause exhaust components to corrode at a faster rate than other engine parts. Replacement of risers, elbows and manifolds is common. Sierra risers are engineered to meet or exceed manufacturers specifications. Each Chrysler compatible riser is an exact OEM match and is leak tested for quality assurance. Mating surfaces are CNC machined to provide the best possible seal without additional preparation. Precision castings feature uniform wall thickness and are primed and painted to stand up to the marine environment. Look no further than a Sierra riser for a quick out of the box installation. Key Features Meets or exceeds manufacturer specifications Machined mating surfaces allow installation without additional preparation Each riser features uniform wall thickness and is leak tested for quality assurance Pre-painted to stand up to marine environment Risers can be used on port or starboard side Requires Sierra gasket p/n 18-0472-1 Fits Chrysler 273, 318,340 and 360 cu. in. engines manufactured between 1966—1986 Backed by SeaStar Solutions Limited Two-Year Warranty 18-1945 Application Guide ApplicationOEM Part NumberBarrCM-20-6674Chrysler Inboard2846689Mallory9-40312Osco689The Sierra Engine Parts SelectorIn addition to exhaust risers, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourEngine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.