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Thread: 351C thermostat
          
   
   

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  1. #1
    grifo7's Avatar
    grifo7 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 68 Iso Grifo 7 Liter,
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    351C thermostat

     



    I have a 351C 4V in my 73 Iso Fidia (Italian sedan). Engine is stock (except for Edelbrock intake & carb). It has a re-cored rad, new cap, high-flow180 stat (Milodon 16401), and I have just replaced the head gaskets. Cooling seems OK now, not like before when it would boil over after idling for even a few minutes (gasket problems, I'm pretty sure).
    I am about to fit a Milodon high volume aluminum water pump as well, and my question is: should I still leave the restrictor plate with the small hole in it, in the thermostat housing, or remove it? What does this thing do??

    Thanks guys,
    Chris

  2. #2
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    Where is the restrictor? The thermostat should be in the housing.......
    Yesterday is history, tomorrow is a mystery, Live for Today!
    Carroll Shelby

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  3. #3
    grifo7's Avatar
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    There is a metal plate below the thermostat with a small hole in the centre.
    Chris

  4. #4
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    Is the restrictor in the bypass hose???? Guess I'm still not following you on where it is exactly....
    Yesterday is history, tomorrow is a mystery, Live for Today!
    Carroll Shelby

    Learning must be difficult for those who already know it all!!!!

  5. #5
    grifo7's Avatar
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    Dave,

    I guess what I am referring to is the "bypass orifice", a brass disc with a central hole, which on the Cleveland sits in the well below the thermostat on top of the front of the block. It has "Top" stamped on it.
    I have just read (in the Hot Rod book covering the 351C & Boss 351 engines) that this part should never be removed, even if running no thermostat, as most of the coolant will then flow directly into the water pump rather than to the rad, causing overheating.
    Sounds like I've answered my own question - unless anyone out there knows different...
    Chris

  6. #6
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    That's correct, leave the restrictor in place....
    Yesterday is history, tomorrow is a mystery, Live for Today!
    Carroll Shelby

    Learning must be difficult for those who already know it all!!!!

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