What is the normal operating TEMP for a Stock 350??? Is 205degrees to hot???

Discussion in 'Troubleshooting & Diagnosis' started by 75ltexan, Sep 21, 2009.

  1. 75ltexan

    75ltexan Member

    Jan 22, 2007
    I took my '75 stock 350 maro out for a Hwy. cruise. Most of the Highway trip was running around 185 degrees (2700rpms) , but when I went up to 3000rpms the TEMP went to 205degrees and stayed there. Is this a high reading??

    ps ---the car is due for a coolent flush.

    Thanks in advance, Mark
  2. onovakind67

    onovakind67 Veteran Member

    Jul 8, 2001
    Fairfield, CA
    An engine running at 205° is not a hot engine at all.
  3. COPO

    COPO Veteran Member Lifetime Gold Member

    Sep 15, 1999
    Ontario, Canada
    Stock thermo was a 195* therefore on hot drives where you hammer the throttle it'll be +5* to +10* more.
    Last edited: Sep 22, 2009
  4. Gary S

    Gary S Administrator Lifetime Gold Member

    Apr 14, 1999
    Bismarck, North Dakota
    That is about right. If your cooling system can keep up 100%, you can expect to see that 5-10 degrees rise over whatever thermostat you are running. If the cooling system comes up short under certain conditions, the temp will rise more than that.
  5. ronald66

    ronald66 Veteran Member Lifetime Gold Member

    Jul 11, 2008
    mine runs at 180*,is that to low??im i risking something??

    thanks Ron
  6. doc221978

    doc221978 Veteran Member

    Nov 29, 2008
    Allenhurst, GA.
    If your cooling system is very effective and you have a 160-180 t-stat, then running 180 would be fine. Depends on the engine and plugs, but typically 180-210 seems very normal. If I ever get to 220 I shut down, but that is just trying to be safe.
  7. COPO

    COPO Veteran Member Lifetime Gold Member

    Sep 15, 1999
    Ontario, Canada
    Below 180* is when you start to worry.

    The only reason the factory installed a 195* thermostat is so the car would pass emissions.
    If you go with a 160*, IMO, it'll be too cold. I like'm between 180*-190*.
    Last edited: Sep 23, 2009
  8. Lrader99

    Lrader99 Veteran Member Lifetime Gold Member

    Sep 18, 2005
    NW Georgia
    engine oil temp needs to be atleast 160 water temp needs to be atleast 170 its not uncommon to see a water temp of 220 and an oil temp of 240. anything more than that its getting hot
  9. camaro19791000

    camaro19791000 Veteran Member

    Feb 28, 2009
    El paso Texas
    I have a 160 thermostat, it runs 180 during the day wit out smashing the throttle, 200 when its smashed, and at night runs 160 smashed or not...is that fine?i always stopped the car when it got to 210
  10. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

    Sep 20, 2004
    Southern Maryland
    Camaro1979, I personally would put a 180 in your car, and I bet it will still run the same temps 180-200 during the day, but at night the 180 stat will keep you from dipping below 180.

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