Radiator overflow hose size?

[vandelay industries]

Radiator overflow hose size?

i'm ASSuming 73-91 was the same? But to be specific, for 83 model year and small block.

Note this is the smaller hose running from the radiator cap to the overflow tank, NOT the hose running from the thermostat to the radiator or from the radiator to the water pump.

 

[diesel4me]

3/8" was what fit my 82 K2500's diesel radiator overflow nipple under the cap...not sure if they are all the same though..

 

[Fastereddie]

I’ve seen 3/8 and 5/16. Depends what you have.