Sierra
OMC GM Small Block V8 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.
Figure #DescriptionO.E.M. #Sierra #
1MANIFOLD3857723 18-1986
2ELBOW GASKET (Included in 18-8507 mounting kit. )909786 18-0943
3MANIFOLD ELBOW913784, 3855270, 3850459, 3857944 18-1909
4MOUNTING BOLT (Included in 18-8507 mounting kit. )N/ANSS
5HOSE FITTING 3/4" - 14NPT X 1" Hose (Corrosion Resistant Brass Fitting)N/A18-8216
6HOSE FITTING 3/4" - 14NPT X 1" Hose (Corrosion Resistant Brass Fitting)N/A 18-4461
7HOSE FITTING 3/4" - 14NPT X 3/4" Hose (Corrosion Resistant Brass Fitting)N/A18-8215
8MANIFOLD GASKET (Included in 18-8550 mounting kit. )96306 18-2949
9MOUNTING STUD (Included in 18-8550 mounting kit. )N/ANSS
10MOUNTING KIT (Includes 18-2949 manifold gasket. )N/A 18-8550
11MOUNTING KIT (Includes 18-0943 elbow gasket. )N/A 18-8507
Q:
The Volvo OEM part?
A:
Replaces Volvo OEM #'s: 835966 & 856034.


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.


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Price: $19.99
Save: $7.00
(25% Off $26.99)
Part # 18-8507
2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
No Reviews
Replaces OEM part #
  • OMC 3856444
For:
  • OMC/Volvo GM Small Block V8 305-350 cu.in.

Used With:
  • Riser: 18-1909
Price: $8.22
Save: $7.76
(48% Off $15.98)
Part # 18-0943-1-9
2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
No Reviews
Pkg. of 2
Used with: 18-1909

Replaces OEM part #
  • OMC 909786
  • OMC 3850496
Price: $21.87
Save: $6.11
(21% Off $27.98)
Part # 18-2949-9
2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
No Reviews
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

Price: $11.15
Save: $4.48
(28% Off $15.63)
Part # 18-4461
2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
Hurry! Only 1 left in stock
No Reviews
Replaces OEM part #
  • MERCURY MARINE 22-807155
3/4" - 14 NPT X 1" Hose
Corrosion Resistant Brass Fitting
Price: $209.94
Save: $60.05
(22% Off $269.99)
Part # 18-1909-1
2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
No Reviews
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
Price: $207.55
Save: $127.44
(38% Off $334.99)
Part # 18-1986-1
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
Hurry! Only 1 left in stock
No Reviews
Port and Starboard
For:
  • GM Small Block V8 305-350 ci
  • 5.0L & 5.7L GM (New Style)

Use with:
  • Exhaust Manifold Gasket: 18-2949
  • Mounting Kit:18-8550

Replaces OEM part #
  • OMC 3852374-2
  • OMC 3857723
  • VOLVO 3852374-2
  • VOLVO 3857723
Price: $192.99
Save: $56.89
(22% Off $249.88)
Part # 9-40911
2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
No Reviews
Riser
4" Exhaust outlet 7° down angle
Use 9-40672 mounting kit
OEM 913784, 3855270, 3850456, 3855270-9
Price: $108.97
Save: $140.91
(56% Off $249.88)
Part # T-20909
2nd Day Air for $2 More Eligible
SHIPS TOMORROW!* if ordered in 21 hrs 27 mins.
No Reviews

OMC and Volvo Riser, 4" exhaust outlet, 7° down angle.


Replaces OEM #:

  • OMC 913784
  • OMC 3855270
  • OMC 3850456
  • Volvo 3855270-9

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