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:
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 drill out hole in riser to install temperature sensor on Sierra 18-1909-1?
A:
There is port already in it.


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:
Can I purchase the long?
A:
We will need to know engine application to see if we can match up manifold gasket.


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


Ask a question
Question & Answer Guidelines
This product ships in 1 business day.
Add to Cart and enter your Postal Code to determine the shipping charges.
Most products and orders leave our warehouse in 1 business day. However, select items may take more processing time. Alaska and Hawaii orders please add 1 additional warehouse processing day.
Standard Shipping Policies
Price: $18.43
Save: $9.70
(34% Off $28.13)
Part # 18-8507
2nd Day Air for $2.99 More Eligible
SHIPS TODAY!* if ordered in 11 hrs 35 mins.
Hurry! Only 1 left in stock
No Reviews
Replaces OEM part #
  • OMC 3856444
For:
  • OMC/Volvo GM Small Block V8 305-350 cu.in.

Used With:
  • Riser: 18-1909
Price: $11.60
Save: $4.54
(28% Off $16.14)
Part # 18-0943-1-9
2nd Day Air for $2.99 More Eligible
SHIPS TODAY!* if ordered in 11 hrs 35 mins.
No Reviews
Pkg. of 2
Used with: 18-1909

Replaces OEM part #
  • OMC 909786
  • OMC 3850496
Price: $21.87
Save: $6.97
(24% Off $28.84)
Part # 18-2949-9
2nd Day Air for $2.99 More Eligible
SHIPS TODAY!* if ordered in 11 hrs 35 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: $11.87
Save: $3.72
(23% Off $15.59)
Part # 18-4461
2nd Day Air for $2.99 More Eligible
SHIPS TODAY!* if ordered in 11 hrs 35 mins.
No Reviews
Replaces OEM part #
  • MERCURY MARINE 22-807155
3/4" - 14 NPT X 1" Hose
Corrosion Resistant Brass Fitting
Price: $192.33
Save: $77.66
(28% Off $269.99)
Part # 18-1909-1
2nd Day Air for $2.99 More Eligible
SHIPS TODAY!* if ordered in 11 hrs 35 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: $255.80
Save: $82.69
(24% Off $338.49)
Part # 18-1986-1
SHIPS TODAY!* if ordered in 11 hrs 35 mins.
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 $2.99 More Eligible
SHIPS TODAY!* if ordered in 11 hrs 35 mins.
No Reviews
Riser
4" Exhaust outlet 7° down angle
Use 9-40672 mounting kit
OEM 913784, 3855270, 3850456, 3855270-9
Price: $123.62
Save: $126.26
(50% Off $249.88)
Part # T-20909
2nd Day Air for $2.99 More Eligible
SHIPS TODAY!* if ordered in 11 hrs 35 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.