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Forum: Sprint Car Tech Talk (go)
Moderators: BigDog

Topic: Hilborn coolant fittings
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April 24, 2012 at 09:12:40 AM
Joined: 01/14/2012
Posts: 8

What size/thread are the coolant fittings on a Hilborn manifold? Specifically, what fiitings do I need to order? Thanks.

April 26, 2012 at 09:45:32 AM
Joined: 01/14/2012
Posts: 8

Can anyone tell me of any other websites where you might actually get help with technical questions?

May 26, 2012 at 09:35:04 AM
Joined: 10/07/2011
Posts: 18

Do you not own a tape measure?


Theyre either AN-ORB fittings (straight thread) or NPT pipe threads. I forget which.

Just go look at your manifold and measure them!


May 26, 2012 at 08:51:55 PM
Joined: 12/16/2006
Posts: 69


I have an old Hilborn, and mine is AN-8. It is the same thread as a -8 hose fitting. The chart in my Speedway catalog says that thread size is actually 3/4-16, same as a 3/4 fine thread bolt, which would be a good way to verify that's what you have. Speedway calls the fittings you need "high flow o-ring port fittings" Get the straight ones and put 90 degree ends on your hoses. The blue push-lock hose works fine for that.

Good luck,


May 29, 2012 at 09:19:48 AM
Joined: 01/14/2012
Posts: 8
Thank you jbracing, I made some phone calls and got the O-port fittings. Wileboar....there are many different thread styles that measure the same, but each is slightly different. Just looking for some help to make sure I got the right one the first time. Obviously you are not the type to give that help.

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