Sierra / Mallory

Additional Details:

• For: GM 454, 525 (7.4L & 8.2L)

Interchanges/Replaces

GLM

• 39890

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	2	Exhaust Manifold Mounting Gasket		N/A
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	2	Exhaust Elbow 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

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: Mercruiser GM 4 cyl. 181 cu. in. (models 120, 140, 2.5L & 3.0L)
• For: GM Inline 6 cyl.250-292 cu. in. (models 165 & 200)
• For: Ford Small Block V-8302-350 cu. in. (models 215, 225, 233 255 & 888)
• For: GM Small Block V-8 305, 350 cu. in. (models 198, 228 & 898)

Use With:

• 18-4009: Manifold End Plate

Interchanges/Replaces

Mallory

• 9-40570

Osco

• 60252-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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: Mercruiser GM Small Block V-8 305-350 cu. in. (models 198, 200, 228, 230, 260 & 898)

Use With:

• 18-1950-1: Manifold
• 18-1951-1: Manifold
• 18-1953-2: Manifold

Interchanges/Replaces

Mallory

• 9-40573

Osco

• 7214-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
NSS	Mercruiser Stern Drive 10-52143	4	Screw	No Image	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: Mercruiser GM 229 & 262 cu. in. (models 185 & 205)

Use With:

• 18-1952-1: Manifold

Interchanges/Replaces

GLM

• 32175

Mallory

• 9-40576

Osco

• 9745-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
NSS	Mercruiser Stern Drive 10-52143	6	Screw	No Image	N/A

Additional Details:

• For: Pleasurecraft Ford Small Block V8 302 and 351 cu.in.

Use With:

• 18-1996: Manifold

Interchanges/Replaces

Mallory

• 9-40870

Osco

• 28001-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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

Key Features:

• OMC GM Small block V8 305-350 cu. in. (1979-89)
• OMC/Volvo GM Small Block 305-350 cu. in.

Use With:

• 18-1902: Manifold
• 18-1903: Manifold
• 18-1931-1: Manifold
• 18-1986-1: Manifold

Interchanges/Replaces

Mallory

• 9-40671

Osco

• 244-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
18-3720	GLM 21160 Mallory 9-72002 9-72002-10 Mercruiser Stern Drive 11-34932 11-82671013 Mercury Marine 11-34932 11-82671013	6	Stainless Steel Locknut

Key Features:

• Volvo GM Small Block V8 305-350 cu.in.

Additional Details:

• Models: AQ & BB200, 205, 211, 231, 225, 260, 271, 290, 311, 500, 501, 570, 571 & 572

Use With:

• 18-1931-1: Manifold

Interchanges/Replaces

Mallory

• 9-40970

Osco

• 5805-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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:

• Barr & Indmar Ford Small Block V8 302-351 cu. in.

Use With:

• 18-1904: Manifold
• 18-1998-1: Manifold
• 18-1907: Riser

Interchanges/Replaces

Mallory

• 9-40172

Osco

• FL-994MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
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
18-4258	Crusader 113186 GLM 21892 Mallory 9-41205 Mercruiser Stern Drive 22-33198 22-33198A1 22-41622 22-46754 Osco 1016012	3	Pipe Plug		N/A

Additional Details:

• For: Crusader GM Small Block V8 305-350 cu.in (Models 220, 270)
• For: Crusader GM Big Block V8 454 cu.in (Models CH350, 454XL)

Use With:

• 18-1918: Elbow
• 18-1928: Elbow w/ 4" Outlet
• 18-1934: Elbow w/ 3" Outlet
• 18-0309-1: Exhaust Elbow Gasket

Interchanges/Replaces

Mallory

• 9-40470

Osco

• 6562-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0309-1	Barr CR 47 C 96562 Crusader 96562 Mallory 9-65401 Osco 6562	1	Exhaust Elbow Gasket		N/A

Additional Details:

• For: Crusader GM Big Block V8 454 cu. in.

Use With:

• 18-1929: Manifold
• 18-1933: Manifold

Interchanges/Replaces

Mallory

• 9-40473

Osco

• 799-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

Interchanges/Replaces

GLM

• 34300

Johnson/Evinrude Outboard

• 317955

Mallory

• 9-60435

Interchanges/Replaces

GLM

• 33190

Johnson/Evinrude Outboard

• 309170
• 319348

Interchanges/Replaces

GLM

• 33190

Johnson/Evinrude Outboard

• 309170
• 319348

Key Features:

• V-6

Interchanges/Replaces

GLM

• 33590

Johnson/Evinrude Outboard

• 321182

Mallory

• 9-60433

Additional Details:

• For: Mercury V-135/V-150

Interchanges/Replaces

GLM

• 32540

Mercury Marine

• 27-96440
• 27-99776
• 27-997761

Additional Details:

• For: Mercury V-175/V-200

Interchanges/Replaces

Mallory

• 9-60046

Mercury Marine

• 27-99176
• 27-991762
• 27-991763
• 27-991764

Mercury Race Outboard

• 27-99176

Key Features:

• Compounded rubber flapper valves prevent water from entering the exhaust system
• Made with weather resistant EPDM with U/V stabilizer

Additional Details:

• Includes: Stainless Steel Clamp
• Size: 3" or 76.2mm

Interchanges/Replaces

GLM

• 89240

Mallory

• 9-44000

Mercruiser Stern Drive

• 34765A1
• 34765A2