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where to drill hole in t stat

Discussion in 'Small Block Tech' started by ceas350, Apr 28, 2010.

  1. ceas350

    ceas350 "THE BURNER"

    Where does it need to be
     
  2. DaWildcat

    DaWildcat Platinum Level Contributor

    To what end? I see no reason to do so if it's working properly.

    Devon
     
  3. cstanley-gs

    cstanley-gs Silver Mist

    Ive heard of this being done, but dont recall the reason...

    subscribing to see other replies...
     
  4. TheSilverBuick

    TheSilverBuick In the Middle of No Where

    I drill a ~1/16th hole near the edge, then install the thermostat with the hole at the top just to aid in getting the air out of the system. I've never actually bothered to time how long it takes with or with out the hole, so I have no actual proof of anything =P but when filling the cooling system it does give the air a place to go as the coolant fills up the block.
     
  5. mjt

    mjt Well-Known Member

    I drill a hole (1/16" I believe) close to the outer edge - you'll want
    to put your thermostat in the housing and see how far out you
    can drill the hole. When you install it, be sure the hole is at the
    12 o'clock position, so any air pockets can migrate through.

    EDIT: some thermostat manufacturers drill the hole and install
    a copper "bobber" pin in the hole.
     
  6. ceas350

    ceas350 "THE BURNER"

    Thanks a lot guys. I plan on replacing my leaky t stat gasket, so I will do it then
     
  7. mjt

    mjt Well-Known Member

    While you have the thermostat out, you might want to test it to
    be sure it opens at the prescribed temperature.
     
  8. ceas350

    ceas350 "THE BURNER"

    Well guys I have been keeping track since i drilled the hole in the t-stat and it looks like temps have dropped 10-15 degrees :beers2: depending on driving condithions and my overflow bottle stopped overflowing
     
  9. tlivingd

    tlivingd BIG BLOCK, THE ANTI PRIUS

    This unfortunately should be done with new ones as well. I've had a couple bad ones (Stant brand) right out of the box. The misses candy thermometer and a pot of boiling water with a bit of salt (salt to raise the boiling temp)
     
  10. gstewart

    gstewart Well-Known Member

    the last new trhermostat i installed, a few ago already had the 1/16" hole drilled.
     

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