Increase riser height for clearance or put exhaust outlets further above the waterline 4" 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…
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…
Replace corroded or freeze damaged Pleasurecraft risers easily Exhaust risers and manifolds have a tough life. Constant exposure to salt and fresh water and heat cycling promotes corrosion resulting in failure sooner than other engine parts. Inspection and consequent replacement is common. Sierra…
Replace corroded risers or increase riser height and hose clearance for inboard installations Exhaust system components take a beating from prolonged exposure to salt and fresh water and being constantly heat cycled. As a result they corrode at a rapid rate. Replacement is not uncommon. If…
Add height and hose clearance to inboard exhaust systems. If combatting exhaust back-flow or clearance issues, a spacer can make a big difference. Sierra spacers provide the extra height to exhaust elbows and help prevent water from traveling back into the riser when throttling down. Installation…
Mounting KitOMC GM Small Block V8 305-350cu.in. (1979-1989)and multiple application Ford and GM Risers
Exhaust Elbow Mounting KitBarr, Indmar and Marine Power Ford Small Block V8 302-351cu.in.GM Small Block V8 305-350cu.in.GM Big Block V8 454cu.in.
ID: 3 1/2" x 4 1/2"; Engine type: 5.7L, 7.5L (1986 and up); Replaces OMC 912374-1
Dedicated connector hoses save time. Having the right length and diameter hose speeds up the job. Sierra engineered these jumper hoses to replace the Volvo Penta and OMC hoses that connect risers to the exhaust tubes. Every Sierra part meets or exceeds factory specifications to ensure fit and…
Dedicated connector hoses save time. Having the right length and diameter hose speeds up the job. Sierra engineered these jumper hoses to replace the Volvo Penta and OMC hoses that connect risers to the exhaust tubes. Every Sierra part meets or exceeds factory specifications to ensure fit and…
Cast by the leading grey-iron foundries in the US, these manifolds are built to OEM specifications and are 100% leak tested. New e-coat painting process for better paint adhesion and corrosion resistance. Ready to be installed out of the box, with precise fit and function. 140hp 3.0L (181 CID) 4…
Fits most 140hp 3.0L four-cylinder models. Replaces OMC P/N 987784.
Replaces: OMC 980617
These are the brawniest hose clamps we can find.Designed to assure proper coupling retention for large ID marine exhaust hose. T-Bolt Band Clamps offer a 360 clamping surface, and are ideal for any below-waterline application. All clamps are 316 stainless steel with 1/4" hardware. 3/4" band…
Sierra exhaust tube for Mercury Marine engine.OEM Part Number:32-807458T
Replaces: OMC 321940
Replaces: OMC 318995
Replaces: OMC 320981
Replaces: OMC 328755
Replaces: Mercury Marine 94576