Thermostat Housing 

Additional Details:

• Material: Stainless Steel
• Fits: MCM/MIE GM V-8 (454 & 502 cid) engines

Use With:

• 18-1989K: Thermostat Service Kit

Interchanges/Replaces

Mallory

• 9-42500

Mercruiser Stern Drive

• 861006A1
• 8M0061381

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-4264	GLM 21894 Mallory 9-40546 Mercruiser Stern Drive 22-32803 22-87543 FI5880010 Mercury Marine 22-32803	3	Pipe Plug
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
NSS	Mercruiser Stern Drive 23-806922	1	Sleeve	No Image	N/A