If the upper radiator hose is hot then the T Stat is fine. If your lower radiator hose is cool but the upper is hot your radiator may be clogged.

Radiator is almost new, so I still suspect water pump...

I'd a pressure check on your cap and system. A typical sympton of a bad cap is the slow leakage of coolant.

Dos it run good? All this is assuming that your running at the right timing & fuel curves for your engine.

What is total advance & what is it under light load?

Where is your sensor at?

coolant issue
 

Also- since your heater line appears to go slightly up from the front of the manifold, did you turn on the heater when filling it? This would help get any air pockets that would sit up in that line after draining your coolant.

Of the coolant you lost: Did you see the coolant on the ground? Where did it go? Due to expansion / contraction, you will see different level from cold-hot-cold. Has the level stayed constant in your expansion tank?

Water pump
 

Whew, took off the water pump and I'm glad that was it. Well, glad to have found it anyway...

http://www.camarorestoration.com/gal..._001.sized.jpg

http://www.camarorestoration.com/gal..._002.sized.jpg

That will do it!:cheers:

thanks for the follow-up Tom, it's appreciated. Rare to be the water pump, but in your case there's no doubt............... :yes:

Jody

Oh good you found it!! That has to make you feel a little better!!

In this situation, there shouldn't be any flow coming out of all the ports if you look down in the radiator tank through the cap. A functioning pump and T -Stat will have antifreeze spurting out a few inches. Wish I would have thought of that before you ripped into it. But luckily it was the problem.