'66 Valiant Running Hotter than Expected

"All in" really means little without the rpm info. Regardless I stand by my earlier posts here. Its a sidetrack.
Investigate the basics first.




Only other basic to add would be to test the cap and system with a pressure tester.

I have very light springs in it it’s all in by 2500 RPM more than likely less. And 75 to 80 miles an hour I’m probably turning 3000 3200 RPM.