I gapped mine at .040 roughly or 1mm. Car runs too cool now but up here we have not had a hot day i would consider as of yet. Car runs 140 with 160 stat. and Rodney Red rad. I`m waiting till hot weather to hit before i decide if i need to go to a 180 stat. Then the truth will be known, on my car. I give you this from a thermometer reading from rad after a good run on hiway, and town driving guage is not accurate off by 20*. I have very good flow of coolant through rad now, didn`t before had stamped steel impeller and temps of 210 plus constantly in town on hiway was 180. Sorry for such a long post ,I`m just thrilled to have the opposite problem as of now.
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Scott
If you always do what you always did 
You always get what you always got  
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