Had a Champion, worked a bit better than stock I think but found a much better solution with a 240Z KOYO radiator. Been using the KOYO with my intercooled, turbo-swapped, (early) 260Z with factory A/C, here in PHOENIX, Arizona (not name dropping, just emphasizing the HEAT factor...) for a few years. In my estimation it's much better than the Champion I had - or Mishimoto radiators I've seen in some Z's here in Phoenix...

On 12/8/2025 at 11:14 AM, 72 Datsun 240z said:

We are getting there!

I would still pull that water pump to see if it has the stamped steel impellers .

May have some rusted away or broken as found on some.

That would solve most of it if bad.

Replace with cast iron type pump.

1 hour ago, gundee said:

I would still pull that water pump to see if it has the stamped steel impellers .

May have some rusted away or broken as found on some.

That would solve most of it if bad.

Replace with cast iron type pump.

Cast impeller water pump: https://www.amazon.com/Aisin-WPN-013-Engine-Water-Pump/dp/B008EEZ2XY