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Old 10-10-2024, 02:41 AM   #26
franken
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Re: What would be a good thermostat to run in a 1972 350 chevy?

"If the operating temp remains the same with a 195 and 180 stat the cooling system capacity is not adequate."

The thermostat has nothing to do with the final temp of the coolant once the engine is warmed up. The thermostat isn't there and has no way to do anything other than restrict coolant flow and allow the engine (and therefore the oil) to get warm quicker.

This is at least the 3rd time in this thread that someone has claimed the thermostat determines engine temp, which is nonsense.
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Old 10-10-2024, 05:16 AM   #27
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Re: What would be a good thermostat to run in a 1972 350 chevy?

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Where did you get that info? All the V8 C10 trucks I've seen call for 195 as OEM spec.
Straight from my owners manual.
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Old 10-10-2024, 05:25 AM   #28
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Re: What would be a good thermostat to run in a 1972 350 chevy?

I also found this in the 1967 Truck data book. So apparently they did make changes throughout the years.
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67 C10 283 T5 swapped longbed fleetside = wife's daily driver
67 C20 292 (originally a 250)4speed longbed fleetside w/original wooden bed=my project truck
67 C10 283+.060 (so a 292 as well)T5 swapped longbed fleetside=my DD
72 C1500 Sierra Grande 350 TH350 longbed fleetside=wife's fair weather truck
Can you tell we are fans of longbed fleetsides & 67s
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Old 10-10-2024, 08:01 AM   #29
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Thumbs up Re: What would be a good thermostat to run in a 1972 350 chevy?

Quote:
Originally Posted by 67 twins View Post
Straight from my owners manual.
Nice, a 1967 owner's manual, haven't seen one of those in a while. Interesting, I like seeing this old stuff, maybe more will post other year manuals for comparison. Would like to find one for my 1968. Thanks for posting that.

"67 twins; Except they didn't. V8s came with 180° thermostats and inline 6s came with 195° thermostats"

The original question is what thermostat to use in a '72 C10 with a 350. The '72 owner's manual states it came with a 195. Pretty sure a good 80% were chunked in favor of a 180 at one point in time. It's all good.
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Old 10-10-2024, 08:57 AM   #30
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Arrow Re: What would be a good thermostat to run in a 1972 350 chevy?

195 was primarily used to lower emissions.
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1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...

2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...

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Old 10-10-2024, 09:09 PM   #31
MS66
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Re: What would be a good thermostat to run in a 1972 350 chevy?

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195 was primarily used to lower emissions.
Yep. and it worked!

"1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor..."
What thermostat is in that rig?
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Old 10-11-2024, 07:16 AM   #32
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Lightbulb Re: What would be a good thermostat to run in a 1972 350 chevy?

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Originally Posted by MS66 View Post
Yep. and it worked!

"1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor..."
What thermostat is in that rig?

I've owned it since 2007, and have never had the t-stat out. It has always run cool. I put a NOS Delco 180 degree t-stat in the 1970 Blazer.
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1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion..

1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...

2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...

2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels
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Old 10-11-2024, 09:20 PM   #33
zicc1835
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Re: What would be a good thermostat to run in a 1972 350 chevy?

im glad you all settled that I use a 165 in my 327
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Old 10-12-2024, 11:47 PM   #34
franken
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Re: What would be a good thermostat to run in a 1972 350 chevy?

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im glad you all settled that I use a 165 in my 327
Your engine will be happier and healthier with one hotter...
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Old 10-14-2024, 12:52 PM   #35
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Re: What would be a good thermostat to run in a 1972 350 chevy?

For my 71 with a 250: I switched to a 180 to help mitigate post shutdown carb heat soak. The lower temp thermostat definitely helped keep the fuel from boiling after shutdown. Ran it like that for a couple years. I finally got fed up with the looooooong warm up cycles and went back to a 195 degree. Engine runs a LOT better with the warmer thermostat. I just have to raise the hood when I park the truck in the garage after a drive to minimize carb fuel boil.
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Old 10-14-2024, 02:36 PM   #36
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Re: What would be a good thermostat to run in a 1972 350 chevy?

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Originally Posted by Carl Spangler View Post
For my 71 with a 250: I switched to a 180 to help mitigate post shutdown carb heat soak. The lower temp thermostat definitely helped keep the fuel from boiling after shutdown. Ran it like that for a couple years. I finally got fed up with the looooooong warm up cycles and went back to a 195 degree. Engine runs a LOT better with the warmer thermostat. I just have to raise the hood when I park the truck in the garage after a drive to minimize carb fuel boil.
Sounds identical to my '68 250 truck. I didn't like the 180 in it, and I do sometimes get fuel boil after shut down but nothing I can't deal with. 195 staying in it from now on.
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Old 10-16-2024, 04:23 AM   #37
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Re: What would be a good thermostat to run in a 1972 350 chevy?

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Originally Posted by franken View Post
"If the operating temp remains the same with a 195 and 180 stat the cooling system capacity is not adequate."

The thermostat has nothing to do with the final temp of the coolant once the engine is warmed up. The thermostat isn't there and has no way to do anything other than restrict coolant flow and allow the engine (and therefore the oil) to get warm quicker.

This is at least the 3rd time in this thread that someone has claimed the thermostat determines engine temp, which is nonsense.
Read what I said and think about it. Yes, the coolant system capacity determines operating temp. What I said.
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Old 10-22-2024, 09:53 PM   #38
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Re: What would be a good thermostat to run in a 1972 350 chevy?

well im convinced im changing my 327 to a 195 and the 350 im getting ready for the Doc & Kim build to a 195 also .....as usual ...if you read and can listen this board is a wealth of good solid info
thank you
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