Spark Plug Question

I have a Equus 3145 reader and i agree it is a godsend saved my asss a couple times. I just changed my plugs two days ago pita i did four couple nites ago then the other four the next morning easier on my back that way any how i run autolite 3923 i gapped then at 50 this time the ones i took out were closer to 60
 
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