Header / Expansion Tank info

[TVRleigh]

Is there any recomended size for a header tank. is bigger better or smaller.

Also the old style has a overflow, the new style ones with the new style caps, don't have a overflow pipe. is this because cars are more relible and lesslikly to overflow.

I did have the option on my new tanks made to have them old or new style, I stuck with the old style. (was the the right choice.) I have a TVR400SE RV8 4ltr.

Thanks for any info.