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PostPosted: Thu Oct 27, 2016 2:57 pm 
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EFI Slant 6
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Joined: Sat Jun 17, 2006 9:15 am
Posts: 458
Location: Gainesville, FL
Car Model: 1964 Plymouth Valiant 225, 1977 Dodge D100 225
Hey, everyone. I've seen on here and other places that the heater hose fitting for the cylinder head is 5/8" for the hose and 3/8NPT for the part that goes into the cylinder head. I have an drool tube cylinder head of unknown vintage and it definitely does not fit. I bought a steel one and it didn't fit. Then I got a brass one from another company just to make sure I didn't get the wrong fitting. Same thing.

I used calipers and I get 0.4845" which is nowhere near 1/4 or 1/8 NPT. A half inch bolt kind of fits in there ok.

Don't see it coming up on any car part searches. Has anyone else come across this? Any advice would be appreciated. Thanks!

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PostPosted: Thu Oct 27, 2016 3:55 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6292
Location: So California
Car Model: 64 Plymouth Valiant
Maybe 1/4


http://machiningproducts.com/html/NPT-T ... sions.html

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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PostPosted: Thu Oct 27, 2016 4:03 pm 
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Joined: Wed Oct 23, 2002 7:57 pm
Posts: 7450
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
pretty sure all of the ones I have seen are 3/8" NPT

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 Post subject: agreed
PostPosted: Thu Oct 27, 2016 4:09 pm 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 2118
Location: SF Bay Area
Car Model: 67 dart 2 door hardtop
3/8" NPT

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PostPosted: Fri Oct 28, 2016 8:52 am 
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EFI Slant 6
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Joined: Sat Jun 17, 2006 9:15 am
Posts: 458
Location: Gainesville, FL
Car Model: 1964 Plymouth Valiant 225, 1977 Dodge D100 225
Okay. Here's what I bought, in steel and brass. Neither fit:
http://www.ebay.com/itm/221778485288?_t ... EBIDX%3AIT

https://www.amazon.com/Anderson-Metals- ... 5%2F8&th=1

Just for giggles, I tried to screw in a fitting from my air hose (which is a 3/8 NPT) and it fit fine. It doesn't make any sense, unless both separate vendors sent me the same wrong part. I don't get it. Of course, my town doesn't have any company that sells these sort of fittings in-store, so what do I do? I can't keep flushing $10 down the drain to test these parts out, then pay $5 bucks to send them back.

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PostPosted: Fri Oct 28, 2016 10:11 am 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
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Location: SW Washington
Car Model: Fiat 500e
Your 3/8" air hose doesn't use 3/8" NPT fittings. That's 1/4 NPT.

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PostPosted: Fri Oct 28, 2016 10:59 am 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
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Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Advance Auto? They should have a Dorman part number that would work. Or Auto Zone....etc.

Buy a 3/8 pipe thread nipple at the local hardware store for less than a buck and try it. Then you will know for sure what you need.

Rick


Advance Auto parts - Dorman # 56152 5/8" hose X 3/8" NPT X 1 1/2" long

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 Post subject: thread size
PostPosted: Fri Oct 28, 2016 11:31 am 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 2118
Location: SF Bay Area
Car Model: 67 dart 2 door hardtop
You said your diameter measurement was 0.4845" I assume you measured at the base of the threads nearer the hole - NPT are tapered threads.

3/8 NPT threads at the start are about 0.61" diameter but the pipe itself is 0.68" Same numbers for 1/4" NPT are 0.48" and 0.54", so it based on your measurement it sounds like you have 1/4" NPT.

Brian

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PostPosted: Fri Oct 28, 2016 2:00 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 7450
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
If you have 1/4 NPT to the heater hose, I don't think that size is right. You will have a restriction in the hose to the heater core. If it turns out to be 1/4" I would probably just drill it out and tap it to 3/8" and then all those nipples you bought will work just fine! :lol: :lol:

Was this head on a passenger car/truck? Just trying to figure out why it is so small.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!
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 Post subject:
PostPosted: Fri Oct 28, 2016 3:24 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6292
Location: So California
Car Model: 64 Plymouth Valiant
Could there be a 3/8 to 1/4 reducer bushing in the head?

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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 Post subject: adapter
PostPosted: Fri Oct 28, 2016 4:47 pm 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 2118
Location: SF Bay Area
Car Model: 67 dart 2 door hardtop
Could be there's an adapter in there...

I was thinking the same thing as Rick, even if it is 1/4" NPT, just drill and tap it to 3/8" NPT and your new fittings will work fine. I've never seen other than 3/8 fitting there. Use the steel one, not the brass one....

brian

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