Additional Details:

• Fits: Late model Mercruiser 4 cylinder engines
• Fits: MCM 2.5L & 3.0L/LX (1982 & newer)

Use With:

• 18-1901: Manifold
• 18-1954-1: Manifold
• 18-1955-1: Manifold
• 18-2748: Exhaust Boot
• 18-2833: Exhaust Elbow Gasket
• 18-8551: Hardware Kit [Exhaust Elbow Bolts]
• 18-2819-1: Exhaust Elbow Gasket
• 18-1956-3: Manifold

Interchanges/Replaces

Barr

• MC-20-12076

GLM

• 51160

Mallory

• 9-40555

Marine Power

• 6000-33A

Mercruiser Stern Drive

• 12076A1
• 12076A2
• 95864A2

Osco

• 2076

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2748	GLM 89120 Mallory 9-72805 Mercruiser Stern Drive 32-44348 32-44348001 32-44348T	1	Exhaust Boot		N/A
18-2833	Barr MC472799777 GLM 31520 Mallory 9-61407 Mercruiser Stern Drive 27-52076 27-99777 27-997771 27-997772 27-99777B2 Osco 52076	1	Exhaust Elbow Gasket		N/A
18-710-72-2	Mercruiser Stern Drive 54-31765 54-815504372	4	Hose Clamp-4-1/16 TO 5		N/A
18-8551	GLM 22445 Mallory 9-40585 Osco 2076-MK	1	Hardware Kit [Exhaust Elbow Bolts]

Additional Details:

• Fits: MCM 120 (1993 & newer), 140/3.0L, 470, 165 in-line 6 cyl., GM V-8 small block (1982 & older)
• Fits: Ford V-8 engines

Use With:

• 18-1971: Elbow
• 18-1972: Elbow
• 18-1978: Elbow
• 18-1975-1: Riser With Exhaust Tube

Interchanges/Replaces

Barr

• MC472799777

GLM

• 31520

Mallory

• 9-61407

Mercruiser Stern Drive

• 27-52076
• 27-99777
• 27-997771
• 27-997772
• 27-99777B2

Osco

• 52076

Additional Details:

• Upper Tube: 4" or 101.6mm
• Fits: MCM 120, 140 & GM V-6 & V-8 engines

Use With:

• 18-1975-1: Riser With Exhaust Tube

Interchanges/Replaces

GLM

• 89120

Mallory

• 9-72805

Mercruiser Stern Drive

• 32-44348
• 32-44348001
• 32-44348T

Additional Details:

• Fits: MCM 120

Use With:

• 18-1973: Elbow
• 18-1975-1: Riser With Exhaust Tube

Interchanges/Replaces

Barr

• MC472739915

GLM

• 31410

Mallory

• 9-61423

Mercruiser Stern Drive

• 27-39915

Osco

• 5538-G

Key Features:

• Supplied with mounting package

Additional Details:

• Fits: Most late model 2.5L 153 cid & 3.0L 181 cid w/Rochester carb 5 bolt pattern (1983-89)

Use With:

• 18-4009: Manifold End Plate
• 18-1971: Elbow
• 18-1972: Elbow
• 18-1975-1: Riser With Exhaust Tube
• 18-1978: Elbow
• 18-5021: End Plate
• 18-1204-1: Exhaust Manifold Mounting Gasket
• 18-2832-1: Manifold End Cap Gasket

Interchanges/Replaces

Barr

• MC 1 95862

GLM

• 51214

Marine Power

• 0993-000

Mercruiser Stern Drive

• 95862A5

Osco

• 5862

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-5021	Mercruiser Stern Drive 805629 Osco 5629	1	End Plate		N/A
18-4009	Barr 160252 GLM 51010 Mallory 9-40541 Mercruiser Stern Drive 52999 60252 60252A2 Osco 60252	1	Manifold End Plate		N/A
18-2833	Barr MC472799777 GLM 31520 Mallory 9-61407 Mercruiser Stern Drive 27-52076 27-99777 27-997771 27-997772 27-99777B2 Osco 52076	1	Exhaust Elbow Gasket		N/A
18-2832-1	Barr MC47-27-48043 GLM 31490 Mallory 9-61424 Mercruiser Stern Drive 27-48043 27-480431 Osco 48043	1	Manifold End Cap Gasket		N/A
18-1204-1	Barr MC472796429 GLM 33570 Mallory 9-61419 Mercruiser Stern Drive 27-96429 OMC Stern Drive 912164 Osco MO4-GH	1	Exhaust Manifold Mounting Gasket		N/A
18-0928-1	Barr MC472773814 GLM 30920 Mercruiser Stern Drive 27-73814 27-738141 27-807218	1	Gasket, Manifold End Cap		N/A
18-4263	Chrysler/Force/US Marine 22-328021 22-328022 F700633 FI5810151 GLM 21893 Mercruiser Stern Drive 22-32802 22-328021 22-328022 22-841908 Mercury Marine 22-30139 22-32802 22-328021 22-328022	1	Pipe Plug		N/A
18-4257		1	Pipe Plug		N/A

Key Features:

• Supplied with mounting package

Additional Details:

• Fits: MCM 140 (1982 & older)

Use With:

• 18-4009: Manifold End Plate
• 18-8549: Hardware Kit [Manifold Bolts]
• 18-1971: Elbow
• 18-1972: Elbow
• 18-1975-1: Riser With Exhaust Tube
• 18-1978: Elbow
• 18-5021: End Plate
• 18-1204-1: Exhaust Manifold Mounting Gasket
• 18-2832-1: Manifold End Cap Gasket

Interchanges/Replaces

Barr

• MC 1 96705

GLM

• 51212

Mercruiser Stern Drive

• 52390A1
• 96705A1

Osco

• 6705

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-4009	Barr 160252 GLM 51010 Mallory 9-40541 Mercruiser Stern Drive 52999 60252 60252A2 Osco 60252	1	Manifold End Plate		N/A
18-1990	Barr 1-73813 GLM 51030 Mercruiser Stern Drive 48045 54870 73813 73813A1 73813F1	1	Manifold Block Off Plate		N/A
18-2833	Barr MC472799777 GLM 31520 Mallory 9-61407 Mercruiser Stern Drive 27-52076 27-99777 27-997771 27-997772 27-99777B2 Osco 52076	1	Exhaust Elbow Gasket		N/A
18-2832-1	Barr MC47-27-48043 GLM 31490 Mallory 9-61424 Mercruiser Stern Drive 27-48043 27-480431 Osco 48043	1	Manifold End Cap Gasket		N/A
18-1204-1	Barr MC472796429 GLM 33570 Mallory 9-61419 Mercruiser Stern Drive 27-96429 OMC Stern Drive 912164 Osco MO4-GH	1	Exhaust Manifold Mounting Gasket		N/A
18-0928-1	Barr MC472773814 GLM 30920 Mercruiser Stern Drive 27-73814 27-738141 27-807218	1	Gasket, Manifold End Cap		N/A
18-4257		1	Pipe Plug		N/A
18-4263	Chrysler/Force/US Marine 22-328021 22-328022 F700633 FI5810151 GLM 21893 Mercruiser Stern Drive 22-32802 22-328021 22-328022 22-841908 Mercury Marine 22-30139 22-32802 22-328021 22-328022	1	Pipe Plug		N/A