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OMC Inboard Exhaust System

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Products: 1 - 50 of 101
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Elbow, OMC Sterndrive / Cobra, GM V-8, 18-1921

Elbow, OMC Sterndrive / Cobra, GM V-8, 18-1921

Mfr. Sierra | Mfr No. 18-1921

Elbow, OMC Sterndrive / Cobra, GM V-8, 18-1921. Replaces: Sterndrive/Cobra Inboard/Outboard #909863. Fits most GM V-8 small blocks...
$137.02
On Sale


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Manifold Spacer - Mercruiser, OMC - 18-1949

Manifold Spacer - Mercruiser, OMC - 18-1949

Mfr. Sierra | Mfr No. 18-1949

Manifold Spacer - Mercruiser, OMC - 18-1949. Lifetime warranty on Sierra Manifold Spacers and other Sierra Engine Parts...
$91.70
On Sale


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Riser, OMC / Volvo, 913784, 3855270

Riser, OMC / Volvo, 913784, 3855270

Mfr. Sierra | Mfr No. 18-1909-1

Sierra, Exhaust Elbow, OMC / VP #3855270-9. Sierra manifolds are painted, packaged and leak tested...
$167.15
On Sale


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Direct Replacement Elbow, OMV V6 & V8, OMC-20-981281

Direct Replacement Elbow, OMV V6 & V8, OMC-20-981281

Mfr. Barr Marine by EDM | Mfr No. OMC-20-981281

Direct Replacement Elbow, OMV V6 & V8, OMC-20-981281. Replaces OMC # 907776 & 907777. Fits V-6 Buick engines & Early V-8 Chevy's...
$121.43
On Sale


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Direct Replacement End Cap, OMC V6 & V8, 1-312148

Direct Replacement End Cap, OMC V6 & V8, 1-312148

Mfr. Barr Marine by EDM

Direct Replacement End Cap, OMC V6 & V8, 1-312148. Fits OMC 155 hp V-6 Buick, & OMC Small Block Chevy 283 / 305 / 307 / 350 w/ Round log style manifolds...
Sale Price From $50.81

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Direct Replacement Front End Cap & Gasket, 1-910384

Direct Replacement Front End Cap & Gasket, 1-910384

Mfr. Barr Marine by EDM | Mfr No. 1-910384

Direct Replacement Front End Cap & Gasket, 1-910384. Replaces OMC # 910384. Fits O.M.C. 120 hp 2.5L, & 140hp 3.0L Chevrolet engines...
$46.45
On Sale


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Direct Replacement Log Style Exhaust Manifolds, OMC-1-912441 & OMC-1-912442

Direct Replacement Log Style Exhaust Manifolds, OMC-1-912441 & OMC-1-912442

Mfr. Barr Marine by EDM

Direct Replacement Log Style Exhaust Manifolds, OMC-1-912441 & OMC-1-912442. Replaces OMC # 912441 & 912442. Fits O.M.C. Small Block Chevrolet w/ Log style manifold...
Sale Price From $227.77

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Direct Replacement OMC / Volvo Penta Exhaust Manifold, 1-914035

Direct Replacement OMC / Volvo Penta Exhaust Manifold, 1-914035

Mfr. Barr Marine by EDM | Mfr No. OMC-1-914035

Direct Replacement OMC / Volvo Penta Center Riser Exhaust Manifold, 1-914035. Replaces OMC # 914035 / Volvo # 3857723 (new style). For 5.7 Liter V8 Cobra...
$218.08
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Direct Replacement OMC / Volvo V6 Center Riser Exhaust Manifold, OMC-1-3857656

Direct Replacement OMC / Volvo V6 Center Riser Exhaust Manifold, OMC-1-3857656

Mfr. Barr Marine by EDM | Mfr No. OMC-1-3857656

Direct Replacement OMC / Volvo V6 Center Riser Exhaust Manifold, OMC-1-3857656. For OMC / Volvo 3.8 / 4.3L...
$225.00
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Direct Replacement OMC 120 2.5L Log Style Exhaust Manifold, OMC-1-981462

Direct Replacement OMC 120 2.5L Log Style Exhaust Manifold, OMC-1-981462

Mfr. Barr Marine by EDM | Mfr No. OMC-1-981462

Direct Replacement OMC 120 2.5L Log Style Exhaust Manifold, OMC-1-981462. Uses choke heat source through end cap. Replaces OMC # 979729 & 980459. Fits OMC (Chevrolet) 4-Cylinder 153 C.I.D...
$294.23
On Sale


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Direct Replacement OMC Chevrolet Small Block Round Log Style Exhaust Manifold, OMC-1-979760, OMC-1-979761

Direct Replacement OMC Chevrolet Small Block Round Log Style Exhaust Manifold, OMC-1-979760, OMC-1-979761

Mfr. Barr Marine by EDM

Direct Replacement OMC Chevrolet Small Block Round Log Style Exhaust Manifold, OMC-1-979760, OMC-1-979761. OMC 283, 305, 307 and 350 C.I.D. Fits 185, 200, 225, 230 and 260 H.P...
Sale Price From $262.38

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Direct Replacement OMC Model 120 Exhaust Manifold, OMC-1-982657

Direct Replacement OMC Model 120 Exhaust Manifold, OMC-1-982657

Mfr. Barr Marine by EDM | Mfr No. OMC-1-982657

Direct Replacement OMC Model 120 Exhaust Manifold, OMC-1-982657. Uses choke heat source through exhaust port. Fits OMC 4-Cylinder 153 C.I.D. 120 H.P. 2.5 Liter Chevrolet engines...
$294.23
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Direct Replacement Riser, OMC-20-913784

Direct Replacement Riser, OMC-20-913784

Mfr. Barr Marine by EDM | Mfr No. OMC-20-913784

Direct Replacement Riser, OMC-20-913784. Replaces OMC # 913784...
$155.77
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Direct Replacement Riser, OMC-20-980536

Direct Replacement Riser, OMC-20-980536

Mfr. Barr Marine by EDM | Mfr No. OMC-20-980536

Direct Replacement Riser, OMC-20-980536. Replaces OMC # 979730 & 980536. Fits O.M.C. 120 hp 2.5L Chevrolet engines...
$142.86
On Sale


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Exhaust Manifold Rear End Cap, 1-907885

Exhaust Manifold Rear End Cap, 1-907885

Mfr. Barr Marine by EDM | Mfr No. 1-907885

Exhaust Manifold Rear End Cap, 1-907885. Replacement exhaust manifold rear end cap for OMC 984054 manifold...
$29.51
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Exhaust Bellows, Sterndrive / Cobra, 18-2764

Exhaust Bellows, Sterndrive / Cobra, 18-2764

Mfr. Sierra | Mfr No. 18-2764

Exhaust Bellows, Sterndrive / Cobra, 18-2764...
$24.70
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Exhaust Elbow Gasket, 2.3 OMC Sterndrive / Cobra, 18-0430

Exhaust Elbow Gasket, 2.3 OMC Sterndrive / Cobra, 18-0430

Mfr. Sierra | Mfr No. 18-0430

Exhaust Elbow Gasket, 2.3 OMC Sterndrive / Cobra, 18-0430. Replaces: Sterndrive / Cobra Inboard / Outboard # 912477...
$6.31
On Sale


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Exhaust Manifold Gasket -18-2949

Exhaust Manifold Gasket -18-2949

Mfr. Sierra | Mfr No. 18-2949

Exhaust Manifold Gasket 18-2949 for Crusader, Sterndrive/Cobra and Volvo Penta...
$9.45
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Exhaust Manifold to Cylinder Head Gasket-18-2909

Exhaust Manifold to Cylinder Head Gasket-18-2909

Mfr. Sierra | Mfr No. 18-2909

Exhaust Manifold to Cylinder Head Gasket-18-2909. Replacement for Mercruiser Inboard/Outboard #27-99757. For GM V-6 models...
$6.08
On Sale


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Exhaust Manifold, V8 OMC Sterndrive, 1979-1989 (Port Side), 18-1903

Exhaust Manifold, V8 OMC Sterndrive, 1979-1989 (Port Side), 18-1903

Mfr. Sierra | Mfr No. 18-1903

Exhaust Manifold, V8 OMC Sterndrive, 1979-1989 (Port Side), 18-1903 fits most GM V8 small blocks with end riser...
$170.88
On Sale


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Exhaust Hose

Exhaust Hose

Mfr. Sierra | Mfr No. 18-2779

OMC Exhaust Hose, 18-2779...
$23.79
On Sale


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OMC Exhaust Hose, 18-2780

OMC Exhaust Hose, 18-2780

Mfr. Sierra | Mfr No. 18-2780-1

OMC Exhaust Hose, 18-2780...
$23.45
On Sale


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OMC Exhaust Hose, 18-2781

OMC Exhaust Hose, 18-2781

Mfr. Sierra | Mfr No. 18-2781

OMC Exhaust Hose, 18-2781. Replaces OMC #3852742...
$22.04
On Sale


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Exhaust Manifold, OMC Sterndrive, 1979-1989 V-8 Starboard Side, 18-1902

Exhaust Manifold, OMC Sterndrive, 1979-1989 V-8 Starboard Side, 18-1902

Mfr. Sierra | Mfr No. 18-1902

Exhaust Manifold, OMC Sterndrive, 1979-1989 V-8 Starboard Side, 18-1902. The manifold fits most GM V-8 small blocks with end riser. This product also includes the exhaust manifold gasket...
$173.67


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OMC Rear Riser, Block Off Gaskets

OMC Rear Riser, Block Off Gaskets

Mfr. San Juan Engineering | Mfr No. OV6

OMC Rear Riser, Block Off Gaskets...
Not Currently Available

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Conversion Manifold Kit for OMC Cobra Small Block Chevy (Replaces w/ Center Rise Style Manifolds)

Conversion Manifold Kit for OMC Cobra Small Block Chevy (Replaces w/ Center Rise Style Manifolds)

Mfr. Barr Marine by EDM | Mfr No. OMC-CMKIT-COBRA

Conversion Manifold Kit for OMC Cobra Small Block Chevy (Replaces w/ Center Rise Style Manifolds). Kit replaces original "Log Style" manifolds and risers. Designed to replace old manifolds...
$923.66


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Choke Heat Source, 1-380446

Choke Heat Source, 1-380446

Mfr. Barr Marine by EDM | Mfr No. 1-380446

Choke Heat Source, 1-380446. For use with 981462 manifold. Fits O.M.C. 120 hp 2.5L Chevrolet engines...
$37.64


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Choke Heat Source, OMC V6 & V8, 1-380985

Choke Heat Source, OMC V6 & V8, 1-380985

Mfr. Barr Marine by EDM | Mfr No. 1-380985

Choke Heat Source, OMC V6 & V8, 1-380985, Starboard side only. Fits OMC 155 hp V-6 Buick & OMC Small Block Chevy 283 / 305 / 307 / 350 w/ Round log style manifolds...
$67.09


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Conversion Manifold Kit for OMC Small Block Chevy (Replace w/ Center Rise Style Manifolds)

Conversion Manifold Kit for OMC Small Block Chevy (Replace w/ Center Rise Style Manifolds)

Mfr. Barr Marine by EDM | Mfr No. OMC-CMKIT-SBCHEV

Conversion Manifold Kit for OMC Small Block Chevy (Replace w/ Center Rise Style Manifolds). Kit replaces original "Log Style" manifolds and risers. NOT for Cobras...
$923.66


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Conversion Manifold Kit for OMC Small Block Ford 302/351W (Replace w/ Center Rise Style Manifolds)

Conversion Manifold Kit for OMC Small Block Ford 302/351W (Replace w/ Center Rise Style Manifolds)

Mfr. Barr Marine by EDM | Mfr No. OMC-CMKIT-SBFORD

Conversion Manifold Kit for OMC Small Block Ford 302/351W (Replace w/ Center Rise Style Manifolds). Kit replaces original "Log Style" manifolds and risers...
$940.02


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Direct Replacement Exhaust Elbow to Hose Adapter, OMC-20-907765

Direct Replacement Exhaust Elbow to Hose Adapter, OMC-20-907765

Mfr. Barr Marine by EDM | Mfr No. OMC-20-907765

Direct Replacement Exhaust Elbow to Hose Adapter, OMC-20-907765. Fits O.M.C. 120 hp 2.5L Chevrolet engines...
$49.09


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Direct Replacement Exhaust Manifold Front End Cap / Connector

Direct Replacement Exhaust Manifold Front End Cap / Connector

Mfr. Barr Marine by EDM | Mfr No. 1-908719

Direct Replacement Exhaust Manifold Front End Cap / Connector, Replaces OMC part # 908719...
$51.55


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Direct Replacement Front End Cap, 1-910280

Direct Replacement Front End Cap, 1-910280

Mfr. Barr Marine by EDM | Mfr No. 1-910280

Direct Replacement Front End Cap, 1-910280. Replaces OMC # 910280. Fits O.M.C. 120 hp 2.5L Chevrolet engines...
$58.09


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Direct Replacement High Rise to Adapter Elbow, OMC-20-909368

Direct Replacement High Rise to Adapter Elbow, OMC-20-909368

Mfr. Barr Marine by EDM | Mfr No. OMC-20-909368

Direct Replacement High Rise to Adapter Elbow, OMC-20-909368. For use with 980536 riser. Fits O.M.C. 120 hp 2.5L Chevrolet engines...
$71.18


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Direct Replacement OMC 140hp 3.0L Log Style Exhaust Manifold, OMC-1-984054

Direct Replacement OMC 140hp 3.0L Log Style Exhaust Manifold, OMC-1-984054

Mfr. Barr Marine by EDM | Mfr No. OMC-1-984054

Direct Replacement OMC 140hp 3.0L Log Style Exhaust Manifold, OMC-1-984054. For OMC 181 C.I.D. 140hp 3.0L 4 cylinder engines Replaces OMC part #’s 998083, 980460, 980957 and 982490...
$405.00


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Direct Replacement OMC 155 HP V6 Buick Exhaust Manifold, BV6-1-75-R, BV6-1-75-L

Direct Replacement OMC 155 HP V6 Buick Exhaust Manifold, BV6-1-75-R, BV6-1-75-L

Mfr. Barr Marine by EDM

Direct Replacement OMC 155 HP V6 Buick Exhaust Manifold, BV6-1-75-R, BV6-1-75-L. Fits the Buick V6 engine, all years. Log Style Exhaust Manifold for 155 HP OMC...
$229.09 - $229.09

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Direct Replacement Riser, OMC 140 hp 3.0L, OMC-20-910380

Direct Replacement Riser, OMC 140 hp 3.0L, OMC-20-910380

Mfr. Barr Marine by EDM | Mfr No. OMC-20-910380

Direct Replacement Riser, OMC 140 hp 3.0L, OMC-20-910380. Replaces OMC # 980188 & 910380. Fits O.M.C 140 hp 3.0L Chevrolet engines...
$147.27


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Direct Replacement Riser, OMC-20-980617

Direct Replacement Riser, OMC-20-980617

Mfr. Barr Marine by EDM | Mfr No. OMC-20-980617

Direct Replacement Riser, OMC-20-980617. Replaces OMC # 980617...
$87.55


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Direct Replacement Riser, OMC-20-982680

Direct Replacement Riser, OMC-20-982680

Mfr. Barr Marine by EDM | Mfr No. OMC-20-982680

Direct Replacement Riser, OMC-20-982680. Replaces OMC# 982680. Fits OMC Small block Chevrolet w/ log style manifolds...
$159.55


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Exhaust Bushing, OMC-20-0003

Exhaust Bushing, OMC-20-0003

Mfr. Barr Marine by EDM | Mfr No. OMC-20-0003

Exhaust Bushing, OMC-20-0003. 3"to 3-1/2" bushing for exhaust hose...
$12.27


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Exhaust Elbow Adapter, 30°, 20-0089P

Exhaust Elbow Adapter, 30°, 20-0089P

Mfr. Barr Marine by EDM | Mfr No. 20-0089P

Exhaust Elbow Adapter, 30 Degree, 20-0089P. 30° exhaust elbow adaptor, (includes adaptor, hose and clamps). For use with 3” I.D. exhaust hose.
$39.27


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Exhaust Elbow Mounting Gasket, 47-907764, Pack of 5

Exhaust Elbow Mounting Gasket, 47-907764, Pack of 5

Mfr. Barr Marine by EDM | Mfr No. OMC47-907764

Exhaust Elbow Mounting Gasket, 47-907764, Pack of 5. Replaces: OMC Sterndrive / Cobra Inboard/Outboard #907764...
$16.36


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Exhaust Elbow, 155 OMC, 2 1/2 - 3" Hose, 20-0031

Exhaust Elbow, 155 OMC, 2 1/2 - 3" Hose, 20-0031

Mfr. Barr Marine by EDM | Mfr No. 20-0031

Exhaust Elbow, 155 OMC, 2 1/2 - 3" Hose, 20-0031...
$102.27


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Exhaust Gasket, OMC47-909314, Pack of 5

Exhaust Gasket, OMC47-909314, Pack of 5

Mfr. Barr Marine by EDM | Mfr No. OMC47-909314

Exhaust Gasket, OMC47-909314, Pack of 5...
$49.09


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Exhaust Gasket, Riser to Manifold, MC47-909786

Exhaust Gasket, Riser to Manifold, MC47-909786

Mfr. Barr Marine by EDM | Mfr No. MC47-909786

Direct Replacement Exhaust Riser to Manifold Gasket OMC47-909786 for OMC V8-283, 305, 307 and 350 C.I.D. / Models 185, 200, 225, 230 and 260 HP...
$5.09


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Manifold End Cap Gasket, OMC Sterndrive / Cobra, 18-2860, 5 per Pack

Manifold End Cap Gasket, OMC Sterndrive / Cobra, 18-2860, 5 per Pack

Mfr. Barr Marine by EDM | Mfr No. OMC47-311130

Manifold End Cap Gasket, OMC Sterndrive / Cobra, 18-2860, 5 per Pack. Replacement for Sterndrive/Cobra Inboard/Outboard #311130. 5 per package...
$12.27


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Manifold to Riser Adapter, OMC-20-908014

Manifold to Riser Adapter, OMC-20-908014

Mfr. Barr Marine by EDM | Mfr No. OMC-20-908014

Manifold to Riser Adapter, OMC-20-908014. For use with OMC riser # 980188 & 910380. Fits O.M.C. 120 hp 2.5L Chevrolet engines...
$68.73


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Mounting Hardware kit, 20-0002P for Barr Style Risers & Elbows

Mounting Hardware kit, 20-0002P for Barr Style Risers & Elbows

Mfr. Barr Marine by EDM | Mfr No. 20-0002P

Mounting Hardware kit, 20-0002P for Barr Style Risers & Elbows...
$19.64


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OMC Riser Gasket OMC47-908013 - Pack of 5

OMC Riser Gasket OMC47-908013 - Pack of 5

Mfr. Barr Marine by EDM | Mfr No. OMC47-908013

OMC Riser Gasket OMC47-908013 - Pack of 5. OMC Riser Gaskets for OMC-20-908014...
$16.36


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5.8 Exhaust Manifold, OMC / Ford 302 / 351 5.0 / 5.8L, 3852347

5.8 Exhaust Manifold, OMC / Ford 302 / 351 5.0 / 5.8L, 3852347

Mfr. O.M.C. | Mfr No. 3852347

5.8 Exhaust Manifold, OMC / Ford 302 / 351 5.0 / 5.8L, 3852347...
$652.99


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Products: 1 - 50 of 101
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Post a question or comment about OMC Inboard Exhaust System to our online boating community.
Question
exhaust manifold

I have a 1989 omc 5.8 351 and need exhaust manifolds what kit would I need do you have them also would osco 5603 manifolds fit this engine thanks john

Submitted by: John
Answer

The OEM Manifolds are no longer available. Here is a link to the
OMC 5.8 Manifold Conversion Kit


Question
Cream colored oil

I have a 1984 OMC 2.5 lt. I determined that I had a blown freeze plug on the top rear of engine so I pulled engine and confirmed. I now notice that the oil is the color of an extremely light cup of coffee. How do I determine whether the block is cracked or whether it may be a bad riser and or manifold? Or whether it could be a bad gasket?

Submitted by: steve
Answer

The most common failure is the exhaust manifold. Take it to a radiator shop and have it pressure checked.


 
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