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

Key Features:

• For use with 3" I.D. exhaust hose

Additional Details:

• Material: Cast Iron
• For: Ford Small Block V8 302-351 cu. in.

Use With:

• 18-1997-1: Manifold
• 18-1998-1: Manifold
• 18-4364: Exhaust Elbow Mounting Package (Open)
• 18-8535: Exhaust Elbow Mounting Kit (Blocked)
• 18-8538: Exhaust Manifold Mounting Kit
• 18-0476-1: Riser Block Off Gasket
• 18-2854-1: Exhaust Elbow Gasket

Interchanges/Replaces

Barr

• 20-0100
• 20-0102

GLM

• 56120

Indmar

• 53-2009
• 53-2018

Mallory

• 9-40112

Osco

• 2018