Sierra
OMC GM Small Block V8 (1979-89) Sterndrive/Cobra Exhaust Manifold Exploded View
OMC Sterndrive/Cobra Exhaust Manifold Exploded View Diagram and Parts
Fits GM Small Block V8 305-350 cu. In.
1979-1989
Figure #DescriptionO.E.M. #Sierra #
1MANIFOLD (STARBOARD)912441 18-1902
2MANIFOLD (PORT)912442 18-1903
3ELBOW GASKET (Included in 18-8534 mounting kit. )909786 18-0943
4MANIFOLD ELBOW909863 18-1921
5MOUNTING BOLT (Included in 18-8534 mounting kit. )N/ANSS
6MANIFOLD GASKET (18-1903. Included in 18-8502 )96306 18-2949
7MOUNTING STUD (Included in 18-8502 mounting kit. )N/ANSS
8MOUNTING KIT (Includes 18-2949 manifold gasket. )N/A 18-8502 or 18-8550
9MOUNTING KIT (Includes 18-0943 elbow gasket. )N/A 18-8534
10HARDWARE KIT (Hardware only for Elbow 18-1921. )N/A 18-8553
11MANIFOLD ELBOWN/A 18-1909
12MOUNTING KITN/A 18-8507
Q:
Will this fit my 1989 chevy 5 litter port side?
A:
This fits most GM V-8 small blocks with end riser. So it will depend on your engine type. If you have model number we should be able to cross reference if you need more assistance.


Q:
I have a 5.7GSPLKD the riser gaskets are bad and I would like to replace them. I would also like to replace the exhaust flapper and bushings. Volvo no longer sells them- Obsolete. Would also like 2 fuel and 2 water seperator filters.?
A:
For the gasket you need 18-4431-9 or OEM number 3863191. As for the flapper we do not offer it, OEM number is 3855517. As for the fuel/water separator filters, you need either part number 18-7989 or OEM number 3862228.


Q:
Do you have a Exhaust-Manifold-Elbow for a Volvo penta 7.5 GL??
A:
Unfortunately we will need to know the full model number to your engine to match up elbow. We do not list a 7.5GL, but we have different 7.4GL models. Please confirm.


Q:
The Volvo OEM part?
A:
Replaces Volvo OEM #'s: 835966 & 856034.


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Your Price: $18.02
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Replaces OEM part #
  • OMC 3856444
For:
  • OMC/Volvo GM Small Block V8 305-350 cu.in.

Used With:
  • Riser: 18-1909
Your Price: $8.22 (Out of stock)
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Part # 18-0943-1-9 2nd Day Air for $2 More Eligible
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Pkg. of 2
Used with: 18-1909

Replaces OEM part #
  • OMC 909786
  • OMC 3850496
(Out Of Stock)
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Pkg of 2
Replaces OEM part #
  • CRUSADER 96306
  • BARR CHV-47-000
  • VOLVO 835966-3
  • VOLVO 856034-4
  • MERCURY MARINE 27-33395
  • MERCURY MARINE 27-33395B

Use with:
  • 18-1931-1: Manifold
  • 18-1986-1: Manifold
  • 18-1997-1: Manifold
  • 18-1902: Manifold
  • 18-1903: Manifold
  • 18-1904: Manifold
  • 18-1914: Manifold
  • 18-1925: Manifold
  • 18-1926: Manifold
  • 18-1950-1: Manifold
  • 18-1951-1: Manifold
  • 18-1953-2: Manifold
For:
  • AQ200, 225, 260, 271, 290, 311, V-8

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OMC Riser, 4" outlet 7 degrees. Fits many GM & Ford center rise manifolds
Use with:
  • Manifold: 18-1986
  • Riser Gasket: 18-0943
  • Mounting Kit: 18-8507


Replaces OEM part #
  • OMC 913784
  • OMC 3857944
  • OMC 3855270
  • OMC 3850456
  • VOLVO 3857944-7
  • VOLVO 3855270-9
  • VOLVO 3850456
Your Price: $158.18
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Part # 18-1902
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V-8 Starboard Side
Fits most GM V-8 small blocks with end riser
Use with: Mounting Kit 18-8502

Replaces OEM part #
  • OMC 912441
Your Price: $39.31
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Fits:
  • OMC Gm Small Block V8 305-350 cu. in.
    ( 1979-89 ) OMC/Volvo GM Small Block 305-350 cu. in.

  • Use with: Manifolds 18-1931-1, 18-1902 & 18-1903, 18-1986. Includes mounting studs and hardware

Your Price: $141.25
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Fits most GM V-8 small blocks
Use with:
Manifold: 18-1902, 18-1903
Elbow Gasket: 18-0943
Mounting Kit: 18-8534

Replaces OEM part #
  • OMC 909863
Your Price: $172.82
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Part # 18-1903
Replaces OEM part #
  • OMC 912442 V-8 Port side
    Fist most GM V-8 small blocks with end riser
    Use with: mounting Kit: 18-8502
Your Price: $12.49
Save: $4.00
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Part # 18-8553 2nd Day Air for $2 More Eligible
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Used with: Exhaust Elbow 18-1921
Your Price: $10.48
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Part # 18-8534 2nd Day Air for $2 More Eligible
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OMC GM Small Block V8 305-350 cu. in.
( 1979-1989 ) and multiple application
Ford and GM Risers
Used with: Riser 18-1921
Your Price: $192.99
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Part # 9-40911 2nd Day Air for $2 More Eligible
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Riser
4" Exhaust outlet 7° down angle
Use 9-40672 mounting kit
OEM 913784, 3855270, 3850456, 3855270-9
Your Price: $201.99
Save: $68.01
(25% Off $270.00)
Part # 9-40601
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Manifold, Port
Fits 305 - 350 CID V-8
Includes hose and clamp
Use 9-40671 mounting kit
OEM 910144, 909279, 912442
Your Price: $201.99
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Part # 9-40602
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Manifold, Starboard
Fits 305 - 350 CID V-8
Includes hose and clamp
Use 9-40671 mounting kit
OEM 909280, 912441
Your Price: $111.16
Save: $158.84
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Part # T-20903
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OMC Manifold, port


Replaces OEM #:

  • OMC 909312
  • OMC 908488

Engine Type:
GM Small Block V8 305-350 cu.in.


Engine Model Years:
1979 to 1989

Your Price: $212.87 (Out of stock)
Save: $146.13
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Part # T-20905
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Mercruiser Elbow/Reservoir


Replaces OEM #:

  • Mercruiser 90880
Cap included.

Fits Mercruiser cast iron manifold #99908. Fitting not included.


Engine Type:
Mercruiser 3.7L engines


Engine Model:
165, 170, 180, 190, 470 and 3.7L

(Out Of Stock)
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