How full to fill aftermarket ic and coolant tanks??

[mitrls10]

Ok I know the stock tanks are about a inch below the bottom of the cap opening for max fill level and the aftermarket ic tanks should be the same but the main thing I'm wondering is on the coolant expansion tank do you fill them an inch below as well or do you fill them all the way up to the cap cause it seems like the big hump on the tank is enough room for the coolant to expand. Any1 know or how full is every1's that has aftermarket tanks thanx..

 

[utfan98]

I filled both of my aftermarket tanks to about 1/4" from the neck for the radiator res. and 1/4" from the lip of the opening on the IC tank.

 

[jm@ReischePerf]

I would think anywhere from 1/4" to 1/2" from the top would give enough room for expansion.