Touch, feel, smell?? Oh come on now. And a properly tuned engine wll feel hot to the touch. I use a drop of water myself. Also i tune by how it runs.....which is important. I also like to see smoke but alot of smoke doesnt mean your engine is running rich. BTW RB's and some toehrs run as high as 280F.
BTW, what's the proper way to do the drop of water test. I put a drop near the plug and see what's what. At my current seting, it just stays there
I think it's near the plug and not the top of the head cuz my water never boils on the top of the head.