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Technical Blown 392 normal operating temps?

Discussion in 'Traditional Hot Rods' started by atomictrent, Apr 27, 2019.

  1. atomictrent
    Joined: May 6, 2013
    Posts: 111

    atomictrent
    Member

    Just finishing up the 32 and wanted input on what a normal operating temp for a blown 392 should be. Seems like she is running way too cool on the first few shakedown drives.
    april272019.jpg
     
    Vanness, Hollywood-East and triumph 1 like this.
  2. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 1,169

    wheeltramp brian
    Member

    What is way too cool?I'd say between 170 -190 is good
     
  3. atomictrent
    Joined: May 6, 2013
    Posts: 111

    atomictrent
    Member

    That is what I was figuring, but this one seems to be running at like 140°

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  4. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 1,169

    wheeltramp brian
    Member

    Thermostat may be stuck open?
     

  5. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,583

    Rusty O'Toole
    Member

    What's your thermostat? Try a 180 if you have a good cooling system. 195 if you feel real confident and have a 16# pressure cap. That is a big hunk of iron, it takes a lot to warm it up. It may take 10 miles of driving or more to reach full temp, sitting in the driveway idling it may never reach full temp.
     
  6. Make sure where your sender is that it is completely submerged in the coolant. If there is an air bubble, it will not read correct.
     
  7. moparjimd60
    Joined: Jan 22, 2018
    Posts: 71

    moparjimd60

    I have a 354 blown hemi with a 180 thermostat and temp sender in the back of the drivers side head . It takes about 10 miles to get to 180 if it’s cool outside it runs 160-170 at 45 mph. It gets 200-210 in traffic on a warm day. But cool right down when we get moving. I had a large air bubble in mine I could not drive it for a couple days and it would still have pressure on the cap it took almost a gallon to fill it now I can check it next morning and no pressure, I kept burping the system till I got it all out . They hold about 4 gallons. Hope this helps


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  8. rd martin
    Joined: Nov 14, 2006
    Posts: 2,449

    rd martin
    Member
    from indiana

    looks like it should be a blast to drive! very kool.
     
  9. atomictrent
    Joined: May 6, 2013
    Posts: 111

    atomictrent
    Member

    That is exactly the info I was looking for! Thank you!
     
    moparjimd60 likes this.
  10. When in doubt about trapped air, raise the front of the car a foot and let it run a bit.
     

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