I was scratching my head on my setup too. The first fire up, to break in the cam, didn't take too long to get up to the 180 T stat temp, and it never got above that the whole 20+minutes. A couple of days later I fired it up to set the idle, timing and carbs and it took forever to get to the 180*. I'm thinking that these radiators we have, with the shroud, plus we both have the same fan, which really does move some air, is doing the job! I'm running E free, 91 octane also. I'm sure that helps a lot too. And a Water Wetter with dist.water. Glad to hear your back on the road again Ed!