Bypass hose and fitting dilemma

Discussion in 'Small Block Mopar Engine' started by prorac1, Apr 8, 2018.

  1. prorac1

    prorac1 Well-Known Member

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    1983 318 with an early 273 timing cover and drivers side water pump. Holley aluminum intake.

    Water pump and intake has no fittings. Just 3/4 pipe thread holes.

    Here's the dilemma. I picked up both bypass hoses. Early and late. Than I picked up some 3/4npt x 3/4" barb fittings.

    Than I discover that the late model hose is 1" ID (way to big), but the early hose is still 13/16". Lol.

    3/4 npt x 3/4" barb is the biggest brass fitting I've been able to find.

    The 3/4 barb fits the 13/16" hose "OK", and it might snug up with the hose clamps. But it dosent slip onto the barb as snug as I would like.

    What's every one running and where do you get your fittings? Menards isn't getting it done for me this time. Lol.

    Also need to source the 3/8 npt x 5/8 heater hose fittings as well.

    Thanks. Eric
     
  2. Krooser

    Krooser Reform School Graduate

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    Find some used ones...
     
  3. sireland67

    sireland67 Well-Known Member

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    McMaster-Carr
     
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    • 67Dart273

      67Dart273 Well-Known Member

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      Go down to HD or Lowes and buy a 3/4" nipple x" long, say, 6. If you don't have some way to clamp it without thread damage, buy a coupling "or something" so you can clamp it in the vise. Go home, saw the thing off so you have threads and an appropriate length of nipple, and install your hose.

      If you are "inventive" you can pliers tighting the thing "way out" at the end so the hose goes over any scarring and the clamp is up near the threads, IE it will seal
       
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      • jazak5

        jazak5 Well-Known Member

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        • prorac1

          prorac1 Well-Known Member

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          I'm assuming this is because the 3/4npt nipple has the same tube diameter as the 1" hose, and your not dealing with barb size?
           
        • prorac1

          prorac1 Well-Known Member

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        • 67Dart273

          67Dart273 Well-Known Member

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          Yes 3/4 is pretty close to 1" OD

          On a side note, 1/8 is close enough to 3/8OD that you can use it sometimes for fuel connections, and 3/8 is close to 5/8 for heater hose use.
           
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          • lemondana

            lemondana BlackDart

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            There is a place called FittingsandAdapters.com that has all of those fittings you can't find elsewhere. The one for the Holley intake is part no. BHB-12-12, 3/4 hose id. and 3/4 male pipe thread. I'm sure they have the water pump fitting also. You have to look real hard on their website so you don't overlook them.
             
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            • krazykuda

              krazykuda FABO Gold Member FABO Gold Member

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              • 65wgn440

                65wgn440 Well-Known Member

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                You can also get a kit from Summit or Mopar Performance that includes the hose, clamps, and one 3/4 npt x 1" nipple. If your water pump is 3/4 npt also, you can get another fitting separately. Just went through this, also.
                 
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                • YY1

                  YY1 Well-Known Member

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                  Go to the u-pull with a pipe wrench and a strap wrench.

                  I also have, believe it or not, a gate hinge that works in the slots of the nipple.

                  They might not even charge you.

                  I always harvest the ones from my used pumps before they either go back as cores or go to scrap.
                   
                • prorac1

                  prorac1 Well-Known Member

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                  Went to granger this morning on my way to work and ordered all 4 fittings. They should be in tomorrow. Thank you again for all the help everyone. Eric
                   
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                  • 67Dart273

                    67Dart273 Well-Known Member

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                    By the way use teflon tape or sealant to keep the threads from sticking and RESIST the urge to tighten them. Just snug them........REMEMBER---pipe threads are tapered and you can easily break a casting, 'specially 'luminum, and even iron
                     
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                    • 65ChargerDart

                      65ChargerDart 65ChargerDart FABO Gold Member

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                    • 65ChargerDart

                      65ChargerDart 65ChargerDart FABO Gold Member

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                      The part has changed and the hose end is now barbed.