Thermostat

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Huckleberry

Huckleberry

Member
Joined
Jul 27, 2023
Posts
34
Reaction score
28
Location
Valley Bend WV
First Name
Donnie
Truck Year
1978
Truck Model
K15
Engine Size
350ci
1978 GMC K15, 350 crate engine, no mods all stock. What is the best thermostat for my daily driver?
 
75gmck25

75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
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Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
195 is the best overall. Engines run more efficiently and last longer when they get up to temperature in the 195-200 degree range. Using a lower temp thermostat will not cure overheating or other cooling system issues.
 
fast 99

fast 99

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Location
Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
Do not buy any value brand stat. Either it won't work out of the box, or you'll be changing it within a year.
 
75gmck25

75gmck25

Full Access Member
Joined
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Posts
2,304
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2,277
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
Several year ago I started using the Stewart high flow 195 degree thermostat, and they have worked really well. However, it’s hard to believe how much the price has gone up the last few years.
 
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