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:

• Material: CAST IRON
• For: Port & Starboard

Use With:

• 18-2909: Exhaust Manifold Gasket
• 18-1936: Riser
• 18-2909-9: Exhaust Manifold Gasket (Priced Per Pkg of 2)
• 18-2971: Exhaust Manifold Gasket

Interchanges/Replaces

GLM

• 51640

HGE

• 6894

Volvo Penta

• 856894

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2971-1	Barr VO47-835908 GLM 35080 Mallory 9-65800 Osco 35908 Volvo Penta 835908 856039 857618	1	Exhaust Manifold Gasket		N/A
18-2909	Barr MC47-27-99757 Crusader 97498 GLM 32170 Mallory 9-61421 Mercruiser Stern Drive 27-99757 OMC Stern Drive 3853412 910157 915025 Osco CS-GH Volvo Penta 3853412 856116 Yamaha Sterndrive YSC-12190-00-AC	1	Exhaust Manifold Gasket		N/A

Key Features:

• Greasable Gimbal Bearing

Additional Details:

• For: Alpha I Gen II

Interchanges/Replaces

Mallory

• 9-72904

Mercruiser Stern Drive

• 30-803099T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-3602	GLM 47110 Mallory 9-73002 Mercruiser Stern Drive 32-4172533 32-8M0062309 32-8M0109048	1	Water Intake Hose		N/A
18-7321	GLM 21790 Mallory 9-73115 Mercruiser Stern Drive 54-38863 54-866507 54-8M0090424	1	Bellows Clamp		N/A
18-2743	GLM 31141 Mallory 9-61012 Mercruiser Stern Drive 27-94996 27-949962 27-94996A20	1	Outdrive Mounting Gasket		N/A
18-2840	GLM 31160 Mercruiser Stern Drive 27-35982	1	Bell Housing Gasket		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	2	O-Ring
18-7170	Chrysler/Force/US Marine 25-33504 GLM 82200 Johnson/Evinrude Outboard 307239 Mallory 9-76502 Mercruiser Stern Drive 25-33504 Mercury Marine 25-33504 OMC Stern Drive 307239 3852071 Volvo Penta 3852071	1	O-Ring		N/A
18-7117	GLM 82150 Johnson/Evinrude Outboard 303360 Mallory 9-76507 Mercruiser Stern Drive 25-35027 Mercury Marine 25-35027	1	O-Ring		N/A
18-2750	GLM 89100 Mallory 9-72703 Mercruiser Stern Drive 18654A1 32734 32734A3	1	Exhaust Bellows		N/A
18-2747	GLM 89180 Mallory 9-72704 Mercruiser Stern Drive 816431A1	1	Drive Bellows		N/A
18-2753-2	GLM 89080 Mercruiser Stern Drive 31659 74639 74639A2	1	Shift Cable Bellows		N/A
18-21005	Mallory 9-72412 Mercruiser Stern Drive 30-862540A04 30-862540A3 30-862540T1 30-879194A01	1	Gimbal Bearing		N/A
18-710-16-2		2	Hose Clamp-11/16 TO 1-1/2
18-710-24-2		1	Hose Clamp-1-1/16 TO 2		N/A

Key Features:

• Includes clamp

Additional Details:

• For: All #1, #2 units, Alpha, Bravo I, II, III

Interchanges/Replaces

GLM

• 89080

Mercruiser Stern Drive

• 31659
• 74639
• 74639A2

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-7321	GLM 21790 Mallory 9-73115 Mercruiser Stern Drive 54-38863 54-866507 54-8M0090424	1	Bellows Clamp		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