Additional Details:

• Material: Stainless Steel with square drive
• Thread Size: 3/4" or 19.1mm - 14 NPT
• Note: Pipe sealant with Teflon is recommended for use on plug threads

Use With:

• 18-1949: Manifold Spacer
• 18-1984: Manifold Spacer
• 56507: Loctite Pipe Sealant (PST 6ml w/ Teflon)

Interchanges/Replaces

Crusader

• 113186

GLM

• 21892

Mallory

• 9-41205

Mercruiser Stern Drive

• 22-33198
• 22-33198A1
• 22-41622
• 22-46754

Osco

• 1016012

Key Features:

• Port & Starboard

Additional Details:

• Type: Universal Center Riser Manifold
• Fits: Ford 302 and 351 CID Engines

Use With:

• 18-0603: Exhaust Manifold Gasket Set
• 18-8538: Exhaust Manifold Mounting Kit
• 18-1907: Riser
• 18-1939: Riser
• 18-1949: Manifold Spacer
• 18-1999: Manifold Elbow
• 18-4363: Exhaust Elbow Mounting Package
• 18-8112: Hose Fitting 90°
• 18-0183-1: Exhaust Manifold Gasket

Interchanges/Replaces

Barr

• FM-1-83

GLM

• 56250

HGE

• 1-81

Mallory

• 9-40111

Osco

• FL994
• FLCR818

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2854-1	Barr 01-0107 GLM 36830 Mallory 9-65501 Osco 992-G	1	Exhaust Elbow 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	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	2	Pipe Plug		N/A

Key Features:

• Ford small block V8 302-351 cu.in.
• GM Big Block V8 454 cu.in.
• GM Small Block 305-350 cu.in

Additional Details:

• Size: 3"

Use With:

• 18-1898: Manifold
• 18-1997-1: Manifold
• 18-1998-1: Manifold
• 18-4258: Pipe Plug

Interchanges/Replaces

Barr

• CM 20-0097

GLM

• 56030

Mallory

• 9-40130

Osco

• 994-S3

Additional Details:

• Description: Open

Use With:

• 18-1907: Riser
• 18-1939: Riser
• 18-1999: Manifold Elbow
• 18-1971: Elbow

Interchanges/Replaces

Barr

• 20-0082-P

Mallory

• 9-40171

Osco

• 992-MK

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2854-1	Barr 01-0107 GLM 36830 Mallory 9-65501 Osco 992-G	1	Exhaust Elbow 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	1	Pipe Plug		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

Key Features:

• Barr, Indmar & Marine Power Ford Small Block V8 302-351 cu. in.
• GM Big Block V8 454 cu. in.
• GM Small Block V8 305-350 cu. in.

Additional Details:

• Description: Blocked

Use With:

• 18-1907: Riser
• 18-1939: Riser
• 18-1999: Manifold Elbow
• 18-2854-1: Exhaust Elbow Gasket

Interchanges/Replaces

Mallory

• 9-40173
• 9-40770

Osco

• 992-MK-FW
• CRR-MK-FW

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0476-1	Barr 01-0105 GLM 36820 Mallory 9-65500 Osco 992-G-FW	1	Riser Block Off 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	1	Pipe Plug		N/A