Howe double pass radiator
 

Hey guys, I'm going to be stopping at summit this weekend to pickup some parts and I need some input. I'm going with a Howe double pass radiator, I believe the dimensions are 20x27.75" and has the inlet and outlet on the same side as stock. I believe this radiator has no provisions for a radiator cap or overflow. Since I have a S4 with a cap on both the radiator and the thermostat housing, can I just drill and tap the thermo housing for a barbed fitting to run to an overflow bottle? I'm going to put the bottle where the charcoal canister used to go. I would think I can do this provided the overflow is at about the same height as the nipple. Thanks guys.