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

Key Features:

• Supplied with mounting package
• Port Side

Additional Details:

• Fits: MCM/MIE Ford V-8 engines (1977 & older)

Use With:

• 18-1906: Manifold Spacer
• 18-1971: Elbow
• 18-1978: Elbow
• 18-4008: Block Off Plate
• 18-4009: Manifold End Plate
• 18-0897: Exhaust Elbow Gasket
• 18-2849-1: Exhaust Elbow Gasket
• 18-0183-1: Exhaust Manifold Gasket
• 18-2832-1: Manifold End Cap Gasket

Interchanges/Replaces

Barr

• MC-1-65604

GLM

• 51250

Mallory

• 9-40502

Mercruiser Stern Drive

• 54100A1
• 54100A5
• 65604A12
• 65604A4

Osco

• 5604

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
18-0183-1	Barr FM 47 0000 MC47-27-73866 GLM 33790 Mallory 9-61420 Mercruiser Stern Drive 27-54566 27-73866 OMC Stern Drive 3852455 3853742 908717 916262 Osco FL-GH Pleasurecraft RM0007 Volvo Penta 3852455 3853742	1	Exhaust Manifold Gasket		N/A
18-2832-1	Barr MC47-27-48043 GLM 31490 Mallory 9-61424 Mercruiser Stern Drive 27-48043 27-480431 Osco 48043	2	Manifold End Cap Gasket		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

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:

• Application: V-8 inboard applications only

Use With:

• 18-1950-1: Manifold
• 18-1951-1: Manifold
• 18-1954-1: Manifold
• 18-1955-1: Manifold
• 18-1958-1: Manifold
• 18-1960-1: Manifold
• 18-1962-1: Manifold
• 18-2833: Exhaust Elbow Gasket
• 18-4362: Exhaust Elbow Mounting Package
• 18-1906: Manifold Spacer
• 18-4008: Block Off Plate
• 18-8514: Exhaust Elbow Mounting Kit
• 18-8554: Exhaust Elbow Mounting Kit
• 18-1956-3: Manifold

Interchanges/Replaces

Barr

• MC-20-76771

GLM

• 51190

Mallory

• 9-40556

Mercruiser Stern Drive

• 53779A1
• 53779A2
• 60427A2
• 76771A2
• 76771A3

Osco

• 6771

Use With:

• 18-1971: Elbow
• 18-1978: Elbow

Interchanges/Replaces

Barr

• MC20-60426P

GLM

• 53100

Mallory

• 9-40170
• 9-40586

Osco

• 6371-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
NSS	Mercruiser Stern Drive 11-49838	4	Nut	No Image	N/A
NSS	Mercruiser Stern Drive 13-35048	4	Lockwasher	No Image	N/A
NSS	Mercruiser Stern Drive 16-49545	4	Stud	No Image	N/A

Additional Details:

• For: GM 153 (2.5L) CID Eng; s/n 2324347 & Up

Use With:

• 18-3880: Head Gasket

Interchanges/Replaces

GLM

• 39050

Mallory

• 9-61103

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-3880	GLM 36130 Mallory 9-63704 Mercruiser Stern Drive 27-34273 27-342731 OMC Stern Drive 311210	1	Head Gasket		N/A
18-0347	GLM 32210 Mallory 9-61317 Mercruiser Stern Drive 27-34041 27-52145 27-806452 27-851040 OMC Stern Drive 3852693 912981 913277 Volvo Penta 3852693	1	Valve Cover Gasket		N/A
18-0327	GLM 31350 Mallory 9-60067 Mercruiser Stern Drive 27-33956 27-810848 27-879150138 FI5000200 FI5000219 OMC Stern Drive 311851 3853342 914819 Volvo Penta 3853342	1	Water Pump Gasket		N/A
18-0328	GLM 30100 Mercruiser Stern Drive 27-34208	1	Push Rod / Lifter Cover Gasket		N/A
18-0887	GLM 30360 Mallory 9-61602 Mercruiser Stern Drive 27-34216 27-49953 FI5000201 OMC Stern Drive 3852691 912988 913275 Volvo Penta 3852691 Yamaha Sterndrive YSG-14096-15-6G	1	Timing Cover Gasket		N/A
18-0466	GLM 39470 Mallory 9-61509 Mercruiser Stern Drive 27-14901 27-14901A1 27-52144 OMC Stern Drive 3923440	1	Oil Pan Gasket Set		N/A
18-0356	GLM 31660 Mallory 9-61007 Mercruiser Stern Drive 27-32910 27-64692	1	Carburetor Mounting Gasket		N/A
18-0994	Barr MC472770143 GLM 32180 Mallory 9-61011 Mercruiser Stern Drive 27-70143 27-701431 27-70143B1 27-807982 27-8079821 27-807982B	1	Carburetor Mounting Gasket		N/A
18-0889	Chris-Craft 16.50-00074 GLM 31360 Mallory 9-61041 Mercruiser Stern Drive 27-34213 27-56883 FI5000074 OMC Stern Drive 311064 3852095 Pleasurecraft 3705042 Volvo Penta 3852095 Yamaha Sterndrive YSG-10114-14-1G	1	Fuel Pump 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
18-0928-1	Barr MC472773814 GLM 30920 Mercruiser Stern Drive 27-73814 27-738141 27-807218	1	Gasket, Manifold End Cap		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
18-2833	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
18-0164	GLM 31340 Mallory 9-60074 Mercruiser Stern Drive 27-8146801 OMC Stern Drive 311069 3789161 3852096 Volvo Penta 3852096 Yamaha Sterndrive GM 3789161 YSC-13080-00-0C	1	Thermostat Housing Gasket		N/A
18-2831	Barr MC472747590 GLM 31430 Mallory 9-60012 Mercruiser Stern Drive 27-47590 27-475901 27-47590B1	1	Thermostat Cover Gasket		N/A
18-2896-1	Barr MC472752546 GLM 31550 Mallory 9-61426 Mercruiser Stern Drive 27-32816 27-52546 OMC Stern Drive 311068 Osco CY4-GH	1	Exhaust Manifold Gasket		N/A
18-2819-1	Barr MC472739915 GLM 31410 Mallory 9-61423 Mercruiser Stern Drive 27-39915 Osco 5538-G	1	Exhaust Elbow Gasket		N/A
9-61408	Mercruiser Stern Drive 27-39917	1	GASKET,END CAP TO MANIFOLD		N/A
18-1210-1	Barr MC472739923 GLM 31420 Mallory 9-61409 Mercruiser Stern Drive 27-39923 Osco 52076	1	End Cap to Manifold Gasket		N/A
NSS	Mercruiser Stern Drive 12-73812	1	Gasket, End Cap	No Image	N/A
NSS	Mercruiser Stern Drive 27-35898 27-35898T	1	Gasket, Intake Manifold	No Image	N/A
NSS	Mercruiser Stern Drive 27-34460	1	Gasket, Oil Pump Cover	No Image	N/A
NSS	Mercruiser Stern Drive 27-32815	1	Gasket, Choke Oven Cover	No Image	N/A

Additional Details:

• For: 250 (4.1L) CID eng.; 165 hp s/n 2770032 & Up

Interchanges/Replaces

Barr

• MC47-27-46401A1

GLM

• 39270

Mallory

• 9-61404

Mercruiser Stern Drive

• 27-46401A1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0353	Barr MC47-27-58764 GLM 30510 Mallory 9-61005 Mercruiser Stern Drive 27-58764 Osco 58764	1	Carburetor Mounting Gasket		N/A
18-0356	GLM 31660 Mallory 9-61007 Mercruiser Stern Drive 27-32910 27-64692	1	Carburetor Mounting Gasket		N/A
18-2831	Barr MC472747590 GLM 31430 Mallory 9-60012 Mercruiser Stern Drive 27-47590 27-475901 27-47590B1	1	Thermostat Cover Gasket		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
18-0928-1	Barr MC472773814 GLM 30920 Mercruiser Stern Drive 27-73814 27-738141 27-807218	1	Gasket, Manifold End Cap		N/A
18-2832-1	Barr MC47-27-48043 GLM 31490 Mallory 9-61424 Mercruiser Stern Drive 27-48043 27-480431 Osco 48043	2	Manifold End Cap Gasket
18-2830-1	Barr MC47-27-46401 GLM 31440 Mallory 9-61416 Mercruiser Stern Drive 27-33121 27-46401 27-52584 879036 OMC Stern Drive 907932 Osco CY6-GH	1	Exhaust Manifold Gasket		N/A
NSS	Mercruiser Stern Drive 27-52945	1	Gasket, Carburetor Mounting	No Image	N/A

Use With:

• 18-1971: Elbow
• 18-1978: Elbow

Interchanges/Replaces

Barr

• MC20-60426P

GLM

• 53100

Mallory

• 9-40170
• 9-40586

Osco

• 6371-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
NSS	Mercruiser Stern Drive 11-49838	4	Nut	No Image	N/A
NSS	Mercruiser Stern Drive 13-35048	4	Lockwasher	No Image	N/A
NSS	Mercruiser Stern Drive 16-49545	4	Stud	No Image	N/A

Key Features:

• Supplied with Mounting Package

Additional Details:

• Fits: Most Mercruiser (GM) in-line 6 cyl. engines

Use With:

• 18-8531: Exhaust Manifold Mounting Kit
• 18-0353: Carburetor Mounting Gasket
• 18-1971: Elbow
• 18-1972: Elbow
• 18-1978: Elbow
• 18-4009: Manifold End Plate
• 18-2830-1: Exhaust Manifold Gasket
• 18-2832-1: Manifold End Cap Gasket

Interchanges/Replaces

Barr

• MC 1 58759

GLM

• 51224

HGE

• 8759

Mallory

• 9-40500

Mercruiser Stern Drive

• 52073A1
• 52969A1
• 58759A1
• 58759A10
• 58759A13
• 58759A14

Osco

• 8759

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
18-4256	Mallory 9-40545	1	Pipe Plug		N/A
18-2830-1	Barr MC47-27-46401 GLM 31440 Mallory 9-61416 Mercruiser Stern Drive 27-33121 27-46401 27-52584 879036 OMC Stern Drive 907932 Osco CY6-GH	1	Exhaust Manifold Gasket		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
18-0928-1	Barr MC472773814 GLM 30920 Mercruiser Stern Drive 27-73814 27-738141 27-807218	1	Gasket, Manifold End Cap		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

Additional Details:

• For: Ford 302/351 (5.0L & 5.8L) CID eng: All 888 (188 hp) & 233 hp, 255 hp s/n 3258728-4175498

Interchanges/Replaces

Barr

• MC47-27-54566A1

GLM

• 39310

Mercruiser Stern Drive

• 27-54566A1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2833	Barr MC472799777 GLM 31520 Mallory 9-61407 Mercruiser Stern Drive 27-52076 27-99777 27-997771 27-997772 27-99777B2 Osco 52076	4	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	4	Manifold End Cap Gasket		N/A
18-0183-1	Barr FM 47 0000 MC47-27-73866 GLM 33790 Mallory 9-61420 Mercruiser Stern Drive 27-54566 27-73866 OMC Stern Drive 3852455 3853742 908717 916262 Osco FL-GH Pleasurecraft RM0007 Volvo Penta 3852455 3853742	2	Exhaust Manifold Gasket		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