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OMC Exhaust Manifolds

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Parts Selection Guide

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      • Sierra 18-4218 Drain Tap Replaces 22-16951Q1
        List Price: $10.99
        Starting At: $7.99

        Sierra 18-4218 Drain Tap for Mercruiser, Volvo, OMC Sierra high-quality engine parts are designed to meet OEM specifications. Used with most OEM Manifolds. Fits Mercruiser cylinder blocks & exhaust manifolds Material: Brass Size: 1/4"...

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      • Sierra 18-2833 Exhaust Manifold Elbow Gasket Replaces 27-997772
        List Price: $3.99
        Starting At: $2.99

        Sierra 18-2833 Mercruiser Exhaust Elbow Gasket Sierra high-quality engine parts are designed to meet OEM specifications.  Fits MCM 120 (1993 & newer), 140/3.0L, 470, 165 in-line 6 cyl., GM V-8 small block (1982 & older) Fits Ford...

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      • Sierra 18-0549 Plug Off Cap Replaces 3852476
        List Price: $10.99
        Starting At: $8.49

        Sierra 18-0549 Plug Off Cap 1" I.D. Sierra high quality engine parts are designed to meet OEM specifications. For V8 Stern Drives and Inboards 1977 - present. Interchangeable with: GLM 22290 Johnson/Evinrude...

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      • Sierra 18-4263 Pipe Plug Replaces 22-32802
        List Price: $4.49
        Starting At: $3.49

        Sierra 18-4263 Pipe Plug 1/8"-27 NPT Sierra replacement pipe plug. Thread Size: 1/8" - 27 NPT Material:...

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      • Sierra 18-1998-1 Exhaust Manifold
        List Price: $292.49
        Starting At: $204.49

        Exhaust Manifold - Port & Starboard for Ford V8 Engines by Sierra Fits Port and Starboard Sides. Universal Center Riser Manifold. Use With: Exhaust Manifold Gasket: 18-0183 Exhaust Manifold Gasket Set: 18-0603 Exhaust Manifold Mounting Kit: 18-8538...

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      • Sierra 18-1997-1 Exhaust Manifold
        List Price: $281.49
        Starting At: $196.99

        Universal Exhaust Manifold with Mounting Package by Sierra For Port & Starboard Sides. Universal Center Riser Manifold. Fits: Chriscraft 283, 302, 307, and 350 CID Engines. Crusader 283 and 327 CID Engines thru 1964; 305, 307 and 350 CID Engines 1965...

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      • Sierra 18-0418 Exhaust Manifold Mounting Gasket Replaces 27-46820
        List Price: $15.99
        Starting At: $10.99

        Sierra 18-0418 Exhaust Manifold Mounting Gasket Sierra high-quality engine parts are designed to meet OEM specifications. Fits MCM/MIE GM V-8 (454, 482, 496, 502 & 504 cid) engines. Interchangeable...

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      • Sierra 18-1999 Manifold Elbow
        List Price: $186.49
        Starting At: $130.49

        Sierra 18-1999 Exhaust Elbow Sierra cast iron replacement exhaust elbow; fits 3" I.D. exhaust hose. Replaces: Barr 200082,20-0082 Mallory 9-40810 GLM 56110 Osco 992,CRR-1 Use with...

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      • Sierra 18-4009 Manifold End Plate Replaces 60252A2
        List Price: $85.99
        Starting At: $59.99

        Sierra 18-4009 Manifold End Plate for Mercruiser & OMC Sterndrives Sierra high-quality engine parts are designed to meet OEM specifications. For Use With: 18-1950-1 Manifold 18-1951-1 Manifold 18-1958-1 Manifold 18-1960-1 Manifold 18-1962-1...

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      • Sierra 18-1903 Exhaust Manifold Replaces 0912442
        List Price: $295.99
        Starting At: $206.99

        Sierra 18-1903 OMC Port Exhaust Manifold Fits most GM V8 Small Blocks with End Riser. Use with: 18-1921 Elbow 18-2902 Exhaust Manifold Gasket 18-2902-9 Exhaust Manifold Gasket 18-2949 Exhaust Manifold Gasket 18-8502 Exhaust Manifold Mounting...

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      • Sierra 18-1986-1 Exhaust Manifold Replaces 3857723
        List Price: $353.99
        Starting At: $247.99

        Exhaust Manifold for Volvo, OMC For 5.0L & 5.7L GM Cast Iron (New Style) Engines. Used on both Port and Starboard sides. Replaces: OMC & Volvo 3857723, 3847501, 3857579, 3852374-2,3852374 Mallory 9-40902 Barr OMC-1-914035 GLM 51430 ...

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      • Sierra 18-1992-1 Manifold Elbow Adapter
        List Price: $83.99
        Starting At: $58.99

        Sierra 18-1992-1 Manifold Elbow Adapter Sierra high-quality engine parts are designed to meet OEM specifications. For 3" I.D. Exhaust Hose. 80° Interchangeable with: Barr 200087P Mallory 9-40120

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      • Sierra 18-4258 Pipe Plug
        List Price: $4.99
        Starting At: $3.99

        Sierra 18-4258 Mercruiser Pipe Plug Sierra stainless steel pipe plug with square drive. Note: Pipe sealant with Teflon is recommended for use on plug threads. Thread Size: 3/4" - 14 NPT Use With: 18-1949 Manifold Spacer 18-1984 Manifold...

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      • Sierra 18-4264 Pipe Plug
        List Price: $3.99
        Starting At: $3.49

        Sierra 18-4264 Pipe Plug Sierra high-quality engine parts are designed to meet OEM specifications. For use on Mercruiser Stern Drives and Mercury Marine engines. Using Pipe Sealant with Teflon is recommended for use on plug threads. Thread Size:...

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      • Sierra 18-2850 Manifold End Cap Gasket Replaces 0908935
        List Price: $3.26
        Starting At: $1.65

        OMC Exhaust End Cap Gasket For 1974 - 75 120 HP. Used with Manifold 18-1904. Replaces: OMC - 0908935 Barr - OMC47-908935 GLM - 32980 Redline - RL2850 Mercury 802379  

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      • Sierra 18-1921 Manifold Elbow Replaces 0909863
        List Price: $228.49
        Starting At: $159.99

        Sierra 18-1921 V-8 Small Block Exhaust Elbow Sierra replacement exhaust elbow fits most GM V8 Small Blocks. Use with: 18-1902 Manifold 18-1903 Manifold 18-8534 Exhaust Elbow Mounting Kit 18-8553 Hardware Kit [Exhaust Elbow Bolts] 18-0943-1-9...

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      • Sierra 18-4394 Exhaust Manifold Gasket Set
        List Price: $34.69
        Starting At: $24.29

        Exhaust Manifold Gasket Set - by Sierra Special Order est. 10 Days For: GM 350 (5.7L) CID Eng; 250 HP S/N 4768000-4908849 255 HP S/N 5195909 & UP Contains: 4 18-2832 Manifold End Cap Gasket (OEM 27-48043) 4...

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      • Sierra 18-1909-1 Outlet Riser Replaces 3857944
        List Price: $302.99
        Starting At: $212.49

        7° 4" Outlet Riser - Special Order est. 10 Days OMC Riser, 4" outlet 7°:Fits many GM & Ford center rise manifolds. Replaces: OMC 913784, 3855270, 3850456, 3857944,3856444 Volvo Penta ...

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      OMC Sterndrive Exhaust Manifolds are in stock now.