The Stovebolt Site Forums The Shop Area Engine Shop Clifford intake manifold - NPT fitting?

My '64 C10 has Clifford tune-up parts on the inline-six, including intake manifold for Holley carb.
The manifold has a water jacket and 2 threaded holes to plumb into the water system but I can't find any suitable theaded outlet pipes in England.

The threads look too fine to be NPT but they look tapered - anybody got any ideas please?

The Clifford website seems to have disappeared in recent months - does anyone have a contact number please?
Thanks, Simon

It only makes sence that this water line would be a NPT. Look around on the 64, you may find another NPT part or plug you can remove and try in this hole. I know there are many American cars and trucks in England, many collectors of US militarys vehicles, must be a parts source there. Also I'm sure several of the vendors online can ship the needed parts to you.

Limey,

Here are a few thoughts. Because the manifold is made in the USA the thread configuration would be NPT. Looking into a threaded hole trying to determine pitch can be a though one.

My book of knowledge tells me that, although they are close, BSPT threads cannot be threaded into NPT. The thread count is one off, and the pitch angle is 5 degree different.

I think you have two choices..find a supplier of NPT fittings in your area, or call your cousin in the states and ask for help.

I think a BSPT pipe tap of the correct size might be run into the existing hole to re thread it. Because the NPT thread is so close to the BSPT size, you probably would end up with a semi-bastard configuration..but it would probably work fine. To be sure, instead of pipe dope, coat the thread with a two part epoxy and let it dry.

It's always better to start with a thread configuration that you have access to..swapping back and forth from this size to that size always ends up in disaster, not to mention a funky looking plumbing job. Stay with BSPT!

Go to your hardware store and pick up some threaded adapters and see which one is close. Don't use BSPP as this isn't a tapered thread.

Stuart

I have a Clifford manifold on my 67 K10 and it's NPT. Chris

same as zeeklu, that's what mine is.

Did I misunderstand the original question? Doesn't Limey, who lives in England, have a manifold made in the USA. This manifold has pipe taps for NPT, which is "American"...this sort of makes sense to me!

I would really be worried if my Clifford manifold was tapped for M10 X 1.5 threads.

Stuart

Thanks for the advice guys, must be NPT after all. Zeeklu/Arnswine - any idea what size NPT please, then I can track down some fittings.

The '64 was imported to England in 2003 and the previous owner had hopped it up with a load of Clifford parts.

Cheers, Simon

NPT
US made

Simon, here is a link that may be of some help.

http://www.mcmaster.com/
Hope this helps. Cheers

Wow, what a place - thanks 41chevy

Simon, no prob. hope they have what you need.

That website is INCREDIBLE!!!! Thanks 41!

Hey the information is out there. Some kind person was nice enought to give to me and I just like return the favor and get it to the guys that need it. Mostly OLD BOLTER"S. Best of luck with the restoration.