which thermostat - mild 454? - Chevelle Tech
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post #1 of 10 (permalink) Old May 4th, 12, 12:44 PM Thread Starter
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Tony
 
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which thermostat - mild 454?

Hello

Wondering what temp thermostat to get for my 68 that has a mild 454 installed. No AC, manual trans, stock shroud and radiator. Also are the failsafe units worth getting? Any suggestions welcome

thanks
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post #2 of 10 (permalink) Old May 4th, 12, 1:24 PM
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Re: which thermostat?

Yup, failsafe stats IMO are worth the couple extra dollars they cost,stuck open is much better than stuck closed. I use the 180* failsafe from stant but I think they call them "Superstats" or something like that.

John
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post #3 of 10 (permalink) Old May 4th, 12, 3:37 PM
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Dave
 
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Re: which thermostat?

I would agree, 180* is a good choice. My personal opinion is that 160 is too cold (for a street car) and 195 is too hot for performance, 180 becomes a nice compromise.

-Dave

'70 Chevelle ZZ383/700r4/3.55, 12.25@108 -- Megasquirt2-Extra, Holley Stealthram / Hotchkis A-arms / Hotchkis Springs / B-body 12" brakes / 1.25" F-body swaybar
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post #4 of 10 (permalink) Old May 4th, 12, 3:55 PM
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Greg.
 
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Re: which thermostat?

Here is my 2 cents

The purpose of the Thermostat is to keep the engine temp at a certain minimumal # eg. 180*
and for winter driving to keep you warm, my 67 doesnot see the snow .

In the early 80s I raced my street/daily driver a 65 GTO with a 4 core copper/metal rad
with NO thermostat for years from Spring to Fall, then put her away for the winter !
She would run 170* on the hwy and 180* in town/at the track with no problems .

My 454/468 I cruz in and race now has a 2 core Aluminum Rad with a 180* thermostat,
she started to run to hot (200*-220*) in the warm spring/early summer last year at the track after a couple of back to back runs.

Solution was to take the thermostat out, she then ran 180* - 190* after a couple of back to back runs on the hottest days.

My thoughts are why run a thermostat, if the engine temp without one is 170* when cruzin & higher when pushing her harder !

Just my opinion and what I have done with my car's cooling of the engine temps.

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51 Option
Rebuilt 468/Th400 2,500 stall/ Strange S60 3.70 Gs
Prev Best in street dress in 2014/9/7
60' = 1.77 1/8 = 7.88 et / 88 mph
1/4 = 12.34 et / 110 mph
New Best in street dress on 2015/9/20
60' = 1.756 1/8 = 7.815 et / 89 mph
1/4 = 12.253 et / 111 mph
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post #5 of 10 (permalink) Old May 4th, 12, 4:00 PM
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kevin
 
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Re: which thermostat?

run a mr.gasket 160deg in my 67ss chevelle. motor is a 10.7:1 - 496 with aluminum heads. have found that it pings a lot less with the 160 thermo than the 180 thermo. run the 180 deg during the "winter" we have here.
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post #6 of 10 (permalink) Old May 4th, 12, 5:07 PM
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Dave
 
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Re: which thermostat?

Quote:
Originally Posted by Kirk's67SS View Post
Here is my 2 cents

The purpose of the Thermostat is to keep the engine temp at a certain minimumal # eg. 180*
and for winter driving to keep you warm, my 67 doesnot see the snow .

In the early 80s I raced my street/daily driver a 65 GTO with a 4 core copper/metal rad
with NO thermostat for years from Spring to Fall, then put her away for the winter !
She would run 170* on the hwy and 180* in town/at the track with no problems .

My 454/468 I cruz in and race now has a 2 core Aluminum Rad with a 180* thermostat,
she started to run to hot (200*-220*) in the warm spring/early summer last year at the track after a couple of back to back runs.

Solution was to take the thermostat out, she then ran 180* - 190* after a couple of back to back runs on the hottest days.

My thoughts are why run a thermostat, if the engine temp without one is 170* when cruzin & higher when pushing her harder !

Just my opinion and what I have done with my car's cooling of the engine temps.
A Thermostat also helps get the engine up to operating temperature quicker by keeping water in the engine till it gets up to temperature, which is a good thing. If running with no thermostat works for you, I won't argue it. But IMO, it should be a last resort, not a starting point (for the original poster)

-Dave

'70 Chevelle ZZ383/700r4/3.55, 12.25@108 -- Megasquirt2-Extra, Holley Stealthram / Hotchkis A-arms / Hotchkis Springs / B-body 12" brakes / 1.25" F-body swaybar
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post #7 of 10 (permalink) Old May 4th, 12, 7:13 PM Thread Starter
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Tony
 
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Re: which thermostat?

Thank you everyone. I'll start with a 180 degree failsafe unit
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post #8 of 10 (permalink) Old May 8th, 12, 4:26 AM
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Re: which thermostat - mild 454?

Also, no matter, dont use a regular stamped steel unit. Get a Stainless Steel unit, and drill a 3/8 hole as a bypass.

I used to have a old corroded and caved in "new" regular steel thermostat that I took out of my GTO, when it started overheating. Replaced it with a Super-Stat, and problem was solved. When I sold parts, I used that old 'stat as "proof" of the stuff I was selling at a local parts store.
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post #9 of 10 (permalink) Old May 8th, 12, 2:32 PM
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Greg.
 
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Re: which thermostat?

Quote:
Originally Posted by ChevelleFan70 View Post
A Thermostat also helps get the engine up to operating temperature quicker by keeping water in the engine till it gets up to temperature, which is a good thing. If running with no thermostat works for you, I won't argue it. But IMO, it should be a last resort, not a starting point (for the original poster)

-Dave
I idel/warm my engine up (rad fluide & engine oil) to 150* - 170* in my driveway
for a minute to 2 minutes, to insure all guages are reading what they should
"a green light to go" before driving onto the street,
then drive at lest 3 blocks before getting onto a street that I can speed up to 70km an hour
then another 2 miles with 3 sets of lights before I can drive 80km an hour

my car or any car without a thermostat is/would be/should be at
operating temp by the time they would get near/onto any major hwy !

Unless someone doesnot even bother to warmup their car before hitting the road !

Just a thought
How many or what percentage of Road/Drag Race Car engines have a thermostat in them ?

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51 Option
Rebuilt 468/Th400 2,500 stall/ Strange S60 3.70 Gs
Prev Best in street dress in 2014/9/7
60' = 1.77 1/8 = 7.88 et / 88 mph
1/4 = 12.34 et / 110 mph
New Best in street dress on 2015/9/20
60' = 1.756 1/8 = 7.815 et / 89 mph
1/4 = 12.253 et / 111 mph
Kirk's67SS is online now  
post #10 of 10 (permalink) Old May 11th, 12, 8:03 PM
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Re: which thermostat - mild 454?

A few months a go I saw a chart that showed the wear on various internal parts depending up engine temp. Indicated that the correct temp for a chevy bbc was 190-195 for the least amount of friction/wear.
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