The V8 Owners Forum -

i had a offenhauser manifold that worked fine the temperature would go up to half way then the stat would open and the temp would drop.

ive replaced the offy with an edelbrock rpm manifold but now the temp guage doesnt read much at all the needle never leaves the blue, and header tank pressure is mega

Sounds like a air lock

Hi There

I posted quite good step by step directions for getting rid of air locks. I tried many things including the common lifting the front of the car and allowing gravity to take care of the bubble(s) but all to no avail.
I am running an edlebrock performance inlet manifold with a high flow thermostat too.

If you cannot access the old forum, let me know and i wll post it again

\m/