How to Identify a Straight Through NH carb?

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Fozz71
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How to Identify a Straight Through NH carb?

Post by Fozz71 » Wed Feb 20, 2019 11:03 pm

Can anyone help me identify an NH carburetor and what is the way to ID a straight through carb?

Is it as simple as being able to see through it? Or are there salient features from the side to look for?

Thanks,
Jim
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Scott_Conger
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Re: How to Identify a Straight Through NH carb?

Post by Scott_Conger » Wed Feb 20, 2019 11:09 pm

Straight through on left for both pictures:
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carb pic1.jpg
carb pic3.jpg
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NH Full Flow Float Valves
Obsolete carburetor parts manufactured
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Re: How to Identify a Straight Through NH carb?

Post by tom_strickling » Thu Feb 21, 2019 10:23 am

What extra considerations if any are there for rebuilding a straight through ?
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Mark Osterman
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Re: How to Identify a Straight Through NH carb?

Post by Mark Osterman » Thu Feb 21, 2019 10:35 am

None really .... all the same parts. Just make sure all the little chambers are clean and plugged properly.
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Scott_Conger
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Re: How to Identify a Straight Through NH carb?

Post by Scott_Conger » Thu Feb 21, 2019 10:36 am

They rebuild just like any other NH...no different parts or adjustment.

My opinion is that they will perform only slightly better than the more common sway-back NH, often with slightly harder starting and a greater propensity to spit a little fuel when starting and sometimes when shutting down. Not always, but many people report this. I ran one for awhile on our '13 and believe it was a little harder to start. On a car with a starter, this may be less noticeable.
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Tyranny under the guise of law is still Tyranny

NH Full Flow Float Valves
Obsolete carburetor parts manufactured
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Fozz71
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Re: How to Identify a Straight Through NH carb?

Post by Fozz71 » Thu Feb 21, 2019 7:53 pm

Well I guess I am selling mine on eBay, I didn't realize it was a straight through NH. If you want a nice solid complete one- take a peek.

Thanks for the help ID'ing them, I had no idea how to tell them apart.
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Pep C Strebeck
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Re: How to Identify a Straight Through NH carb?

Post by Pep C Strebeck » Thu Feb 21, 2019 8:59 pm

The one that you have listed on Ebay is not an NH, a straight-thru carburetor yes, but not an NH and not made by Holley. Either a Western Auto or Simmons Super-Power, both aftermarket. There would have been a wire heating element where the brass screw is filling in the hole. Does the carburetor that you have in the listing have the small pot metal flapper in it?
IMG_5139.JPG
IMG_5141.JPG
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Topic author
Fozz71
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Re: How to Identify a Straight Through NH carb?

Post by Fozz71 » Fri Feb 22, 2019 9:39 pm

Where would this pot metal flapper be located at? Both butterflys are the standard steel and brass type so potmetal is gone, no wire has survived.
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Pep C Strebeck
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Re: How to Identify a Straight Through NH carb?

Post by Pep C Strebeck » Fri Feb 22, 2019 10:24 pm

The flapper would be located behind the choke butterfly and would mount/pivot on the small rod attached to the brass screw that can be seen in the photo below:
IMG_5130.JPG

You can see the small rod (horizontal) in this photo. This would normally be behind the choke butterfly but that has been removed in this photo.
IMG_5136.JPG

The flapper is supposed to help with low speed idle and make the carburetor run/operate smoother.
"Remember son, there are two ways to do this: The right way, and your way” Thanks Dad, I love you too.

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