Manta Mirage New Coolant Filler

[Sulley]

I removed my original standard Chevy 350 water neck and replaced it with probably one of the most expensive water necks there is! Here is a link to the product I bought:

http://www.jegs.com/i/Aerospace+Comp...C-FN2/10002/-1

With mid engine vehicles it appears a challenge to keep air out of the system as the radiator is mounted lower than the engine. So this Aerospace Components AC-FN2 Chevy Water Filler Neck hopefully solves this issue. So everything up front is original as in the radiator/cap/overflow hose and the cap is a 25lb psi cap. You can see the before and after pictures attached below.

At the engine you will see the attached images where I removed the original filler neck, installed the new Aerospace aluminum neck with a 20lb psi cap and overflow tube. I ran the car yesterday and it never overheated. I have not installed the overflow/expansion tank yet.

Q for the more experienced. Does the overflow tank itself need to be the highest point? I was just going to mount it low and keep my filler neck at the highest point as seen in the attached images.