Overheating when driving and gas tank building up pressure

[Adam1966C10]

The fan is on the engine side and feels like it is pulling the air properly. That is probably why it does not get hot while stopped I guess. Only heats up at higher speeds.

I will move the vent so it it attached to the tank in another location.

I also will adjust the fuel command center as suggested by Fitech here.
http://fitechefi.com/fitech-uploads/...tionFiTech.pdf

Hopefully this will take care of the over pressure issue.

Thanks for your help.

[Raked 64]

I fought a similar problem on my 64.
Long story, here are the cliff notes:
Engine ran hot at highway speeds and sometimes in traffic
tried several electric fans and even installed a large fixed blade fan
Installed an Edelbrock aluminum water pump ( made it worse)

I believe we finally found my issue. (waiting for the 100 degree heat to be sure)

I run March pulleys and the water pump speed was too fast. (hence the reason the Edelbrock high efficient pump made it worse)

We ran a calculation and slowed down the water pump. I have been running 190 since. I hope it stays there...

Won't take long to do a little measuring and check your setup

[number9]

Had the same issue on a truck I bought in Arizona and drove back home, would only get hot at freeway speeds. The timing was waaaay too far advanced. Stopped by a O'Reilley's store and bought a cheap timing light and distributor wrench. Reset the timing and adjusted the carb and the problem went away, sometimes it is something very simple. By the way it had one of those shiney chrome aftermarket radiators in it that I took to my buddies radiator shop when I got back, flowed like crap. Put in a oem brass style radiator, much nicer. My truck never runs over 190 now, 230 may be alright but it should never run that hot.

[Port&PolishMan]

Originally Posted by padresag

if you had of installed a 3 or 4 core rad it more than likely would have run cooler as you are running a greater volume of water. the main reason for raising the pressure of radiators was due to the use of smaller rads and smaller openings in the grille areas years ago.
ron

I haven't read all the way through , but My 350 has a Desert Rated Rad in it and
I'm still up at 210-215 then it goes back down to 185 and Up again in Traffic

I'm putting in a Precision Stat , those Respond Faster and Hold Temps more Evenly .

4 Row for Sure , in Texas - Dam Hot there .
Also I - like to Note - with 2 Core - Your Pushing Water through it to Fast .
I'm sure You could - Tweak it - By going to Under Drive Pulley's ,180 Precision Stat , & Pusher Fan ..