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Chuck0379
12-13-2017, 06:09 AM
I'm looking at running custom radiator hoses on my BBC 68 Camaro. Trying to find the correct sizes and from what I've found is -20an for upper radiator hose, and -24an for lower radiator hose, is this correct? I will be welding on the bungs onto the radiator, water pump, and thermostat housing. I might leave the bottom hose alone since you don't really see it.

Thanks in advance.

dontlifttoshift
12-13-2017, 07:42 AM
-20 is 20/16" or 1 1/4" and your -24 is 1 1/2" so you need to upsize for a big block.

I don't recommend the AN hoses for radiators as the hose is pretty stiff and that can be hard on an aluminum radiator.

Chuck0379
12-13-2017, 09:12 AM
Would 1.50 for upper and 1.75 lower be the correct size? Everyone sell the hoses but they don’t list the size.

dontlifttoshift
12-13-2017, 09:53 AM
Should be. I have come across big block pumps that were 1 7/8".

Do you not have a way to measure it?

Chuck0379
12-13-2017, 10:07 AM
Not right now. Car at the shop getting headers made.

Frank ZX
12-11-2018, 06:35 PM
I have -20 AN fittings on my bed mounted heat exchanger.
I bought the fittings and hoses from ebay. All Nascar takeoffs and cheap.