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  1. #1
    Join Date
    Nov 2010
    Posts
    108

    AN Radiator Hose Size

    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.


  2. #2
    Join Date
    Sep 2010
    Location
    Beach Park IL
    Posts
    2,376
    Country Flag: United States
    -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.
    Donny

    Support your local hot rod shop!

  3. #3
    Join Date
    Nov 2010
    Posts
    108
    Would 1.50 for upper and 1.75 lower be the correct size? Everyone sell the hoses but they don’t list the size.

  4. #4
    Join Date
    Sep 2010
    Location
    Beach Park IL
    Posts
    2,376
    Country Flag: United States
    Should be. I have come across big block pumps that were 1 7/8".

    Do you not have a way to measure it?
    Donny

    Support your local hot rod shop!

  5. #5
    Join Date
    Nov 2010
    Posts
    108
    Not right now. Car at the shop getting headers made.

  6. #6
    Join Date
    Sep 2011
    Posts
    188
    I have -20 AN fittings on my bed mounted heat exchanger.
    I bought the fittings and hoses from ebay. All Nascar takeoffs and cheap.