I went through every page on this thread and enjoyed looking at the vintage compressors.
I picked up a 45 year old Kellogg 321TX pump is two stage rated up to 8.8 CFM. With the pulleys I have it is about 8.2 CFM.
New bearings in the 2 HP motor. Rebuilt the valves and new unloader valve.
New...
After reading this post I changed my mind on getting one of these.
I went with the Emax industrial PLUS 80 gal silent air. You can easily talk when it is running very happy with it.
I got it on sale so the price was very similar to Eastwood QST-30/60.
Thanks for posting your issues that helped...