Thermostat replacement

Joined
Jun 14, 2008
Messages
63
Can anyone help me with a thermostat replacement. I have a 1991 5.7 Merc Magnum 350 with thunderbolt ignition and a four barrel carb. The outdrive is Alpha one/gen one

I'm reading conflicting threads that claim both 140 and 160.

Thank you in advance.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Thermostat replacement

Depends on your thermostat housing. Designs 1 & 2 used a 140? thermostat, while design 3 used a 160? tstat.


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