340 running hot

Nobody ever said the 195 stat will fix it. The 195 stat is a huge mistake. Huge. This lower stat myth needs to be pounded into oblivion once and for all. It's one big part of the problem. Running a 160 stat is the same as running none, because once the engine reaches 160, it's open all the time. It increases the wear on the engine many times more. All of this has been beat to death so much, it's pathetic. I am to the point where I will read these and just laugh and move on. No one gives a **** about anybody's 30 plus year experience. All most of you younger guys want to do is cram the biggest wheel under your ****, do a 3G Hemi or LS swap. Pitiful.
Glad this comment came back to the top, so I can clarify it due to recent experience. In tuning Vixen, I discovered that she responds best with a 160 high flow thermostat. That was a big part of why I was able to get her to run ping free on pump gas with 175 PSI cranking pressure. So it's all dependent on your combo and tune.

As has been said all over this forum, it's all in the tune.