radiator overflow canister

[oldtrux]

hi folks,i would like to add an overflow tank to my rad.it seems the more i read about vented,non vented the more confused i get!here is a pic of the rad cap i have now,not sure if it's right or wrong for an overflow tank!thanks for any help....dan

[LVPhotos]

I use one on my stock radiator, open to ground. A stock 7lb cap. So unless it's a closed system like some new LS Motors then you should be good.

http://www.speedwaymotors.com/Search...erflow%20tanks

[oldtrux]

Originally Posted by LVPhotos

I use one on my stock radiator, open to ground. A stock 7lb cap. So unless it's a closed system like some new LS Motors then you should be good.

http://www.speedwaymotors.com/Search...erflow%20tanks

ok,thanks for the help!

[oldtrux]

so just to be clear does anyone know if this cap in the photo is vented or non vented?

[geezer#99]

Both rad cap types are 'vented'!!
I could leave you hanging there with that statement but......
That cap is for a rad that has an overflow hose that vents on the ground.
It only has one rubber gasket.
If you're using an overflow bottle that you only catch liquid in it will work fine.
But if you want an overflow bottle that is designed to return the coolant to your rad when it cools down, then you need a cap that has two sealing gaskets. One gasket where yours is and one gasket to seal the cap to the rad flange.
Like one in this link.
http://www.streettunedmotorsports.co...diator_cap.htm

[balesjb]

oldtrux: Where did you get your radiator. I ordered one from Worley Auto fro a 63-66 C-10 and it's not even close. 6" too wide and too thick.
Any assistance would be appreciated. I have a 1964 C-10 Short SS.
Thanks.

[oldtrux]

Originally Posted by geezer#99

Both rad cap types are 'vented'!!
I could leave you hanging there with that statement but......
That cap is for a rad that has an overflow hose that vents on the ground.
It only has one rubber gasket.
If you're using an overflow bottle that you only catch liquid in it will work fine.
But if you want an overflow bottle that is designed to return the coolant to your rad when it cools down, then you need a cap that has two sealing gaskets. One gasket where yours is and one gasket to seal the cap to the rad flange.
Like one in this link.
http://www.streettunedmotorsports.co...diator_cap.htm

geezer,thank you very much....got it!!!

[oldtrux]

Originally Posted by balesjb

oldtrux: Where did you get your radiator. I ordered one from Worley Auto fro a 63-66 C-10 and it's not even close. 6" too wide and too thick.
Any assistance would be appreciated. I have a 1964 C-10 Short SS.
Thanks.

this rad is from rnd fabrication,fit in the lower saddles perfectly,i had to make the upper a little wider!very nice quality radhttp://www.rndfabrication.com

[vince1]

For my other old car I got the small overflow bottle and bracket from a GM Tracker and put it where my regulator used to be. The two mount holes that were drilled on an a diagonal lined up perfectly with two diagonal holes on my fender well, believe it or not. I used to add coolant regularly thinking it was using it but since the bottle it is good for a season or more.

Another way to tell if a cap is designed for an overflow return is to lift that little metal disc at the bottom off its seat. There should be a very light duty spring that pulls it shut again.