Key Features:

• Fits many GM & Ford center rise manifolds
• 4" outlet 7°

Additional Details:

• Material: CAST IRON

Use With:

• 18-1848: Manifold
• 18-1986-1: Manifold
• 18-8507: Exhaust Elbow Mounting Kit
• 18-0943-2: Exhaust Elbow Gasket

Interchanges/Replaces

Barr

• OMC-20-913784

GLM

• 51330

HGE

• 3784

Mallory

• 9-40911

OMC Stern Drive

• 3850456
• 3855270
• 3856444
• 3857944
• 913784

Osco

• 50456

Volvo Penta

• 3855270
• 3857944
• 3863061

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0943-2	Barr OMC 47 909786 GLM 33810 Mallory 9-61452 OMC Inboard 909786 OMC Stern Drive 351325 3850496 909786 913783 Osco 9863-G Volvo Penta 3850496 3863191	1	Exhaust Elbow Gasket		N/A

Key Features:

• OMC/Volvo GM Small Block V8 305-350 cu.in.

Use With:

• 18-1909-1: Riser

Interchanges/Replaces

Barr

• CM 20 6674J P

Mallory

• 9-40672

Osco

• 50456-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0943-2	Barr OMC 47 909786 GLM 33810 Mallory 9-61452 OMC Inboard 909786 OMC Stern Drive 351325 3850496 909786 913783 Osco 9863-G Volvo Penta 3850496 3863191	1	Exhaust Elbow Gasket		N/A
NSS	Mercruiser Stern Drive 13-35048	4	Washer (3/8)	No Image	N/A

Key Features:

• GM Small Block (V8) 305-350 cu. in.
• Port & Starboard

Additional Details:

• Material: CAST IRON

Use With:

• 18-2949: Exhaust Manifold Gasket
• 18-8502: Exhaust Manifold Mounting Kit
• 18-1909-1: Riser
• 18-2949-9: Exhaust Manifold Gasket (Priced Per Pkg of 2)
• 18-2902-1: Exhaust Manifold Gasket
• 18-2902-1-9: Exhaust Manifold Gasket (Priced Per Pkg of 2)

Interchanges/Replaces

Barr

• OMC 1 914035

GLM

• 51430

HGE

• 4035

Mallory

• 9-40902

OMC Stern Drive

• 3852374
• 3857579
• 3857723
• 914035

Osco

• 57579

Volvo Penta

• 3847501
• 3852374
• 3857723

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-710-16-2		1	Hose Clamp-11/16 TO 1-1/2		N/A
NSS	Volvo Penta 21238201	1	Adaptor, Manifold	No Image	N/A
NSS	Volvo Penta 3852538	1	Brass Elbow	No Image	N/A

Use With:

• 18-1909-1: Riser
• 18-1921: Manifold Elbow

Interchanges/Replaces

Barr

• OMC 47 909786

GLM

• 33810

Mallory

• 9-61452

OMC Inboard

• 909786

OMC Stern Drive

• 351325
• 3850496
• 909786
• 913783

Osco

• 9863-G

Volvo Penta

• 3850496
• 3863191