Key Features:

• GM Small Block (V8) 305-350 cu. in. (1979-1989) (Port)

Additional Details:

• For: Port Side

Use With:

• 18-1921: Manifold Elbow
• 18-2949: Exhaust Manifold Gasket
• 18-8502: Exhaust Manifold Mounting Kit
• 18-2902-1: Exhaust Manifold Gasket
• 18-2902-1-9: Exhaust Manifold Gasket (Priced Per Pkg of 2)

Interchanges/Replaces

Barr

• OMC-1-912442

GLM

• 51420

Mallory

• 9-40601

OMC Stern Drive

• 912442

Osco

• 2442

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
18-0550	GLM 22280 Mallory 9-42721 OMC Inboard 909830 OMC Stern Drive 764799 909830	1	Plug Off Cap		N/A
18-7306	Volvo Penta 22274884 853548	1	Hose Clamp		N/A
18-2949	Barr CHV-47-000 MC 47 27 33395 Crusader 96306 GLM 31100 Mercruiser Stern Drive 27-33395 27-33395B Osco CV-GH Volvo Penta 835966 856034	1	Exhaust Manifold Gasket		N/A

Key Features:

• GM Small Block (V8) 305-350 cu.in. (1979-1989) (Starboard)
• V-8 Starboard Side

Use With:

• 18-2949: Exhaust Manifold Gasket
• 18-8502: Exhaust Manifold Mounting Kit
• 18-1921: Manifold Elbow
• 18-2902-1: Exhaust Manifold Gasket
• 18-2902-1-9: Exhaust Manifold Gasket (Priced Per Pkg of 2)

Interchanges/Replaces

Barr

• OMC-1-912441

GLM

• 51410

Mallory

• 9-40602

OMC Stern Drive

• 912441

Osco

• 2441

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
18-2949	Barr CHV-47-000 MC 47 27 33395 Crusader 96306 GLM 31100 Mercruiser Stern Drive 27-33395 27-33395B Osco CV-GH Volvo Penta 835966 856034	1	Exhaust Manifold Gasket		N/A
18-710-20-2	Mercruiser Stern Drive 54-32780 54-32880 54-815504220	1	Hose Clamp-13/16 TO 1-3/4		N/A
18-0550	GLM 22280 Mallory 9-42721 OMC Inboard 909830 OMC Stern Drive 764799 909830	1	Plug Off Cap		N/A

Additional Details:

• Fits: Most GM V-8 small blocks

Use With:

• 18-1902: Manifold
• 18-1903: Manifold
• 18-8534: Exhaust Elbow Mounting Kit
• 18-8553: Hardware Kit [Exhaust Elbow Bolts]
• 18-0943-2: Exhaust Elbow Gasket

Interchanges/Replaces

Barr

• OMC-20-982680

GLM

• 51320

Mallory

• 9-40610

OMC Inboard

• 909863

OMC Stern Drive

• 909863

Osco

• 9863

Key Features:

• OMC GM Small Block V8 305-350 cu. in. (1979-1989) & mult application for Ford & GM risers

Use With:

• 18-1921: Manifold Elbow

Interchanges/Replaces

Mallory

• 9-40670

Osco

• 9863-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

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