The Stovebolt Site Forums The Shop Area The HiPo Shop Radiator Questions- what are these holes

I bought an aftermarket 3 row aluminum radiator for my 54 Chevy 3600. I've got it paired with a 383 stroker.

I took the radiator out of the box and I'm looking at it wondering what am I supposed to do with these two holes at the bottom. It came with a 1/4" threaded barb. I'm just at a bit of a loss of what i should be doing with them or what should be routed to them. Would love some help.

Also here is an overflow tank i'll be installing. Any idea on routing of the two nipples on the bottom. I know one goes up to the cap on the main radiator. Not so sure on the other.

Thanks!

For the radiator, that is an automatic transmission cooler, or heater, as I like to say.

For the overflow, one goes to the radiator neck nipple, the other lets antifreeze drop to the ground.

Thanks so much. Really appreciate it.

As this is paired to a manual can i just block those off?

Yes you can. They are not open to the water/antifreeze anyway but to keep things neat just plug them.

Thank you, really appreciate it

I have the same radiator and the same overflow tank. No more coolant on the floor!

To install the overflow tank, I needed a short length of 1" angle to make it fit. Overflow tank holes on one leg of the angle. Radiator mount holes on the other leg.

I plugged the transmission cooler holes with ear plugs. I haven't looked to see if they are still there.

Do you have any photos you're willing to share? I'm still trying to figure out how I'm going to mount it

Montana 54 chevy If you don't plug them the muddobbers will fill them for you !

I should have taken a picture at the time.... Anyway, hopefully you get the idea. The Phillips head screws came with the tank.

Thanks for sharing. Really like how that tank looks

Common overflow tanks have a dip tube at the top. The bottom of the dip tube reaches close to the bottom of the tank. A hose coming from the radiator overflow nipple at the side of the filler neck attaches to the dip tube.
A second pipe at the top of the overflow tank only goes down a few inches. This allows excess coolant to come out and go to the ground.

Set up this way, coolant will be sucked out of the overflow tank back into the radiator via the dip tube once the coolant in the radiator cools off and contracts causing a vacuum.

Dodge makes this tank I have used in my ‘37 GMC, nice mounting brackets to adapt, come with Cummins engines and smaller Dodge trucks.

Ed