Key Features:

• Will fit either Port or Starboard
• Ideally suited for freshwater applications

Use With:

• 18-0418: Exhaust Manifold Mounting Gasket
• 18-8532: Exhaust Manifold Mounting Kit
• 18-0672: Exhaust Elbow Gasket
• 18-0897: Exhaust Elbow Gasket
• 18-1908: Manifold Riser Spacer
• 18-1970-2: Riser Elbow
• 18-1974-1: Elbow
• 18-1976-2: Manifold Elbow
• 18-1985: Manifold Spacer
• 18-2849-1: Exhaust Elbow Gasket
• 18-8554: Exhaust Elbow Mounting Kit
• 18-8555: Exhaust Elbow Mounting Kit

Interchanges/Replaces

Barr

• MC-1-89011

GLM

• 51240

HGE

• 9011

Mallory

• 9-40506

Marine Power

• 0991-1000

Mercruiser Stern Drive

• 807078Q07
• 807078T08

Osco

• 9011

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0897	Barr MC 20 99208 MC47-27-41813 GLM 30240 Mallory 9-61413 Mercruiser Stern Drive 27-41813 27-860233 27-863724 Osco 8503-GR	1	Exhaust Elbow Gasket		N/A
18-0418	Barr CHVA470000 MC47-27-46820 Crusader 96653 GLM 33760 Mallory 9-61400 Mercruiser Stern Drive 27-46820 OMC Inboard 909613 OMC Stern Drive 3852472 909613 Osco CW-GH Volvo Penta 3852472	1	Exhaust Manifold Mounting Gasket		N/A
18-4224	GLM 13990 Mallory 9-41200 Mercruiser Stern Drive 22-806926A1 22-862210A01	1	Drain Elbow Assembly		N/A

Additional Details:

• Size: 3"
• For: Mercruiser GM V6 229 & 262cu.in (Models 185 & 205)
• For: Mercruiser GM Small block V8 305-350cu.in. (Models 200, 228, 230, 260 & 898)
• For: Mercruiser GM Big Block V8 454cu,in (Models 330, 340 & 7.4L)

Use With:

• 18-1952-1: Manifold
• 18-1953-2: Manifold
• 18-8554: Exhaust Elbow Mounting Kit
• 18-8555: Exhaust Elbow Mounting Kit
• 18-8556: Exhaust Elbow Mounting Kit
• 18-0672: Exhaust Elbow Gasket
• 18-0897: Exhaust Elbow Gasket
• 18-2849-1: Exhaust Elbow Gasket
• 18-1957-2: Manifold
• 18-1970-2: Riser Elbow
• 18-1976-2: Manifold Elbow

Interchanges/Replaces

Barr

• MC-20-93320A3

Mallory

• 9-40530

Mercruiser Stern Drive

• 93320

Osco

• 3320

Key Features:

• Comes with 18-0897 gasket and brass plugs

Additional Details:

• Fits: V-6 & V-8 applications 0° (3" O.D. Riser)

Use With:

• 18-0672: Exhaust Elbow Gasket
• 18-0897: Exhaust Elbow Gasket
• 18-2849-1: Exhaust Elbow Gasket
• 18-8529: Exhaust Elbow Mounting Kit
• 18-1953-2: Manifold
• 18-8554: Exhaust Elbow Mounting Kit
• 18-1957-2: Manifold

Interchanges/Replaces

Barr

• MC-20-98502

GLM

• 51192

Mallory

• 9-40554

Mercruiser Stern Drive

• 98502A2

Osco

• 8502

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0897	Barr MC 20 99208 MC47-27-41813 GLM 30240 Mallory 9-61413 Mercruiser Stern Drive 27-41813 27-860233 27-863724 Osco 8503-GR	1	Exhaust Elbow Gasket		N/A

Additional Details:

• For: Mercruiser GM Big Block V-8 454 cu. in. (models 330, 340 & 7.4L)

Use With:

• 18-1957-2: Manifold

Interchanges/Replaces

GLM

• 33765

Mallory

• 9-40575

Osco

• 9011-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0418	Barr CHVA470000 MC47-27-46820 Crusader 96653 GLM 33760 Mallory 9-61400 Mercruiser Stern Drive 27-46820 OMC Inboard 909613 OMC Stern Drive 3852472 909613 Osco CW-GH Volvo Penta 3852472	1	Exhaust Manifold Mounting Gasket		N/A
NSS	Mercruiser Stern Drive 13-35048	10	Lockwasher	No Image	N/A

Additional Details:

• For: 229 & 262 ci V-6, 305 & 350 SB V-8, 454 Big Block V-8

Use With:

• 18-1906: Manifold Spacer
• 18-1908: Manifold Riser Spacer
• 18-1908K: Manifold Riser Spacer Kit
• 18-1951-1: Manifold
• 18-1952-1: Manifold
• 18-1953-2: Manifold
• 18-1971: Elbow
• 18-1978: Elbow
• 18-2849-1: Exhaust Elbow Gasket
• 18-1970-2: Riser Elbow
• 18-1957-2: Manifold

Interchanges/Replaces

GLM

• 53330

Mallory

• 9-40582

Osco

• 3320-MK
• 6371-MK-SP

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0897	Barr MC 20 99208 MC47-27-41813 GLM 30240 Mallory 9-61413 Mercruiser Stern Drive 27-41813 27-860233 27-863724 Osco 8503-GR	1	Exhaust Elbow Gasket		N/A
18-2849-1	Barr MC 47 27 87105 GLM 32080 Mallory 9-61414 Mercruiser Stern Drive 27-818832 27-860232 27-863726 27-87105 27-871051 Osco 8503-GO	1	Exhaust Elbow Gasket		N/A

Additional Details:

• For: 229 & 262 ci V-6, 305 & 350 SB V-8, 454 Big Block V-8

Use With:

• 18-1908: Manifold Riser Spacer
• 18-1908K: Manifold Riser Spacer Kit
• 18-1952-1: Manifold
• 18-1953-2: Manifold
• 18-1957-2: Manifold
• 18-1976-2: Manifold Elbow

Interchanges/Replaces

GLM

• 53430

Mallory

• 9-40583

Osco

• 3320-MK-X

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0897	Barr MC 20 99208 MC47-27-41813 GLM 30240 Mallory 9-61413 Mercruiser Stern Drive 27-41813 27-860233 27-863724 Osco 8503-GR	1	Exhaust Elbow Gasket		N/A
18-2849-1	Barr MC 47 27 87105 GLM 32080 Mallory 9-61414 Mercruiser Stern Drive 27-818832 27-860232 27-863726 27-87105 27-871051 Osco 8503-GO	1	Exhaust Elbow Gasket		N/A

Additional Details:

• Fits: MCM/MIE GM V-8 (454, 482, 496, 502 & 540 cid) engines
• Fits: Volvo 7.4L, GL, GI, GSI, and 8.2L, GL, GI, GSI

Use With:

• 18-1898: Manifold
• 18-1929: Manifold
• 18-1933: Manifold
• 18-1982: Manifold
• 18-1957-2: Manifold

Interchanges/Replaces

Barr

• CHVA470000
• MC47-27-46820

Crusader

• 96653

GLM

• 33760

Mallory

• 9-61400

Mercruiser Stern Drive

• 27-46820

OMC Inboard

• 909613

OMC Stern Drive

• 3852472
• 909613

Osco

• CW-GH

Volvo Penta

• 3852472

Additional Details:

• For: Standard cooling, restrictor gasket
• Fits: 1981-1997 GM V-6 & V-8 Engines with center rise outlet exhaust manifold

Use With:

• 18-1908: Manifold Riser Spacer
• 18-1974-1: Elbow
• 18-8556: Exhaust Elbow Mounting Kit
• 18-1952-1: Manifold
• 18-1953-2: Manifold
• 18-1958-1: Manifold
• 18-1962-1: Manifold
• 18-1985: Manifold Spacer
• 18-1976-2: Manifold Elbow
• 18-1957-2: Manifold
• 18-1970-2: Riser Elbow

Interchanges/Replaces

Barr

• MC 20 99208
• MC47-27-41813

GLM

• 30240

Mallory

• 9-61413

Mercruiser Stern Drive

• 27-41813
• 27-860233
• 27-863724

Osco

• 8503-GR

Additional Details:

• For: Closed cooling
• Fits: GM V-6 & V-8 with center rise outlet exhaust manifold

Use With:

• 18-1908: Manifold Riser Spacer
• 18-1974-1: Elbow
• 18-1952-1: Manifold
• 18-1953-2: Manifold
• 18-1976-2: Manifold Elbow
• 18-1957-2: Manifold
• 18-1970-2: Riser Elbow

Interchanges/Replaces

Barr

• MC 20 87918
• MC-47-27-41811

GLM

• 30220

Mallory

• 9-61422

Mercruiser Stern Drive

• 27-41811
• 27-860231
• 27-863725
• 27-8637251

Osco

• 8503-GB

Additional Details:

• For: Closed cooling
• Fits: GM V-6 & V-8 with center rise outlet exhaust manifold

Use With:

• 18-1970-2: Riser Elbow
• 18-1976-2: Manifold Elbow
• 18-1908: Manifold Riser Spacer
• 18-1974-1: Elbow
• 18-1952-1: Manifold
• 18-1953-2: Manifold
• 18-1957-2: Manifold

Interchanges/Replaces

Barr

• MC 20 87918

GLM

• 30220

Mercruiser Stern Drive

• 27-41811
• 27-860231
• 27-863725
• 27-8637251

Osco

• 8503-GB

Additional Details:

• For: Standard cooling, full flow 4 slot gasket
• Fits: 1998-2001 Gm V-6 & V-8 with center rise outlet exhaust manifold

Use With:

• 18-1908: Manifold Riser Spacer
• 18-1952-1: Manifold
• 18-1953-2: Manifold
• 18-1958-1: Manifold
• 18-1962-1: Manifold
• 18-1974-1: Elbow
• 18-1976-2: Manifold Elbow
• 18-1985: Manifold Spacer
• 18-8554: Exhaust Elbow Mounting Kit
• 18-1957-2: Manifold
• 18-1970-2: Riser Elbow

Interchanges/Replaces

Barr

• MC 47 27 87105

GLM

• 32080

Mallory

• 9-61414

Mercruiser Stern Drive

• 27-818832
• 27-860232
• 27-863726
• 27-87105
• 27-871051

Osco

• 8503-GO