[DeTomaso] Thermostat Question for the team!

[Dennis Valdez]

Hello all,
I'm changing the Thermostat on my car and have run into a problem that I need some opinions on.
My car is completely stock and I don't think the Tstat has ever been replaced.  Some time ago I purchased the correct 180degree Robertshaw Tstat along with a brass restrictor plate from MARLINJACK.
When I pulled the old Tstat out, I compared it to the new one, and although they look almost identical, the "Hat" on the end of the button on the old Tstat is a bit smaller than the new Tstat on the right in the photo:


The two parts I got from MarlinJack fit together with very little clearance between the hat and the hole in the restrictor plate:


I was hoping to not replace the old restrictor plate, but my concern is that if the hole in the stock restrictor plate is too small, then the new thermostat will not open fully when the larger "hat" does not fit into the smaller hole.


Has anyone seen this problem and have any suggestions?  How does one get the old restrictor plate out of the block? It seems to be a press fit like a freeze plug and I don't want to cause damage trying to pry it out.
Thanks in advance for your help!
Dennis
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   Hello all,
   I'm changing the Thermostat on my car and have run into a problem that
   I need some opinions on.
   My car is completely stock and I don't think the Tstat has ever been
   replaced.  Some time ago I purchased the correct 180degree Robertshaw
   Tstat along with a brass restrictor plate from MARLINJACK.
   When I pulled the old Tstat out, I compared it to the new one, and
   although they look almost identical, the "Hat" on the end of the button
   on the old Tstat is a bit smaller than the new Tstat on the right in
   the photo:
   Inline image
   The two parts I got from MarlinJack fit together with very little
   clearance between the hat and the hole in the restrictor plate:
   Inline image
   I was hoping to not replace the old restrictor plate, but my concern is
   that if the hole in the stock restrictor plate is too small, then the
   new thermostat will not open fully when the larger "hat" does not fit
   into the smaller hole.
   Inline image
   Has anyone seen this problem and have any suggestions?  How does one
   get the old restrictor plate out of the block? It seems to be a press
   fit like a freeze plug and I don't want to cause damage trying to pry
   it out.
   Thanks in advance for your help!
   Dennis
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