Exhaust Elbow Mounting Kit 

Additional Details:

• Caution: Not for fresh water/closed cooling systems
• For: Mercruiser Ford Small Block V-8 302-351 cu. in. (models 215, 225, 233, 255 & 888)
• For: GM Small Block V-8 305-351 cu. in. (models 198, 228 & 898)

Use With:

• 18-1971: Elbow
• 18-1978: Elbow

Interchanges/Replaces

Mallory

• 9-40579

Osco

• 6371-MK-SP

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-4008	Barr MC-20-60207 GLM 50006 Mallory 9-40540 Mercruiser Stern Drive 60207 Osco 60207	1	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
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