1987 350 Mercruiser thermostat choices

[Brando33]

So I’m finding a choice between 140 and 160 degree thermostat for this engine. How shall I choose?

 

[achris]

Merc service manual...

 

[Brando33]

It’s early. I messed this post up.

 

[Brando33]

Merc service manual...

View attachment 355493

Nice. Thank you. You even provided me with some other unknowns. If you could please, can you show me all the notes for this page?

 

[achris]

The note you asked for ^^^...

Below is the block code information in Section 3A the note is referring to.

 

[Scott Danforth]

Raw water cooled, 140. Fresh water cooled 160. Raw water cooled and efi 160, fresh water cooled and efi 180

 

[Brando33]

View attachment 355500
The note you asked for ^^^...

Below is the block code information in Section 3A the note is referring to.

View attachment 355501
View attachment 355502

Rabbit hole alert. Wonder what that has to do with RPM. Thanks

 

[Scott Danforth]

Rabbit hole alert. Wonder what that has to do with RPM. Thanks

Your motor does not have roller cam / lifters

 

[todhunter]

Raw water cooled, 140. Fresh water cooled 160. Raw water cooled and efi 160, fresh water cooled and efi 180

Is the 160 degree thermostat something I can go to an auto parts store to pick up or do I need to buy Mercruiser brand? Same engine as OP...a 1987 Mercruiser 350.

 

[Scott Danforth]

Is the 160 degree thermostat something I can go to an auto parts store to pick up or do I need to buy Mercruiser brand? Same engine as OP...a 1987 Mercruiser 350.

you can order them on amazon, your local automotive store, etc.

always use STANT (that is what Mercuiser used for years and that is what CHAMP heat exchangers used)