4kcsq thermostat mounting

[Tapparoo at aol.com]

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Hey all.  Thanks to those who helped out with the cooling problem, especially
Elliott.
New question.  Replaced water pump, bled system, running about 20% Pentosin
80% distilled water mix.  Not overheating, but definitely running warm.  Which
way does the thermostat go on?  Bentley says "arrow this direction" but the
Wahler thermo I have has no arrow.  Just one bracket that is blank and an
opposing one that says "Wahler made in Germany."  Does it even matter?
Right now I have an 87C in.  Just bought an 80C.  Going to install it, but
want to make sure I mount it correctly.
Thanks in advance.
Dan